diff --git a/api/lib/infrastructure/authentication.js b/api/lib/infrastructure/authentication.js
index c36f6f690b8..c48b7b459ec 100644
--- a/api/lib/infrastructure/authentication.js
+++ b/api/lib/infrastructure/authentication.js
@@ -7,6 +7,20 @@ import boom from '@hapi/boom';
 import { config } from '../../src/shared/config.js';
 import { tokenService } from '../../src/shared/domain/services/token-service.js';
 
+function getOriginFromHeaders(headers) {
+  const urlParts = [];
+
+  urlParts.push(_getHeaderFirstValue(headers['x-forwarded-proto']));
+  urlParts.push('://');
+  urlParts.push(_getHeaderFirstValue(headers['x-forwarded-host']));
+
+  return urlParts.join('');
+}
+
+function _getHeaderFirstValue(headerValue) {
+  return headerValue.split(',')[0];
+}
+
 async function _checkIsAuthenticated(request, h, { key, validate }) {
   if (!request.headers.authorization) {
     return boom.unauthorized(null, 'jwt');
@@ -21,6 +35,12 @@ async function _checkIsAuthenticated(request, h, { key, validate }) {
 
   const decodedAccessToken = tokenService.getDecodedToken(accessToken, key);
   if (decodedAccessToken) {
+    const audience = getOriginFromHeaders(request.headers);
+    console.warn('\n\ndecodedAccessToken audience:', audience, 'decodedAccessToken.aud:', decodedAccessToken.aud);
+    if (decodedAccessToken.aud != audience) {
+      return { isValid: false, errorCode: 403 };
+    }
+
     const { isValid, credentials, errorCode } = validate(decodedAccessToken, request, h);
     if (isValid) {
       return h.authenticated({ credentials });
@@ -93,4 +113,4 @@ const authentication = {
   defaultStrategy: 'jwt-user',
 };
 
-export { authentication };
+export { authentication, getOriginFromHeaders };
diff --git a/api/src/identity-access-management/application/oidc-provider/oidc-provider.controller.js b/api/src/identity-access-management/application/oidc-provider/oidc-provider.controller.js
index f0e8b612db0..3797bce54a7 100644
--- a/api/src/identity-access-management/application/oidc-provider/oidc-provider.controller.js
+++ b/api/src/identity-access-management/application/oidc-provider/oidc-provider.controller.js
@@ -1,3 +1,4 @@
+import { getOriginFromHeaders } from '../../../../lib/infrastructure/authentication.js';
 import { BadRequestError, UnauthorizedError } from '../../../shared/application/http-errors.js';
 import { requestResponseUtils } from '../../../shared/infrastructure/utils/request-response-utils.js';
 import { usecases } from '../../domain/usecases/index.js';
@@ -11,7 +12,9 @@ import * as oidcSerializer from '../../infrastructure/serializers/jsonapi/oidc-s
  * @return {Promise<*>}
  */
 async function authenticateOidcUser(request, h) {
-  const { code, state, iss, identityProvider: identityProviderCode, audience } = request.deserializedPayload;
+  const audience = getOriginFromHeaders(request.headers);
+  console.warn('oidcProviderController.authenticateOidcUser audience:', audience);
+  const { code, state, iss, identityProvider: identityProviderCode } = request.deserializedPayload;
 
   const sessionState = request.yar.get('state', true);
   const nonce = request.yar.get('nonce', true);
@@ -32,6 +35,8 @@ async function authenticateOidcUser(request, h) {
   });
 
   if (result.isAuthenticationComplete) {
+    console.warn('oidcProviderController.authenticateOidcUser pixAccessToken:', result.pixAccessToken);
+
     return h.response({ access_token: result.pixAccessToken, logout_url_uuid: result.logoutUrlUUID }).code(200);
   }
 
diff --git a/api/src/identity-access-management/application/token/token.controller.js b/api/src/identity-access-management/application/token/token.controller.js
index 86950535bb7..09c7ff82057 100644
--- a/api/src/identity-access-management/application/token/token.controller.js
+++ b/api/src/identity-access-management/application/token/token.controller.js
@@ -1,3 +1,4 @@
+import { getOriginFromHeaders } from '../../../../lib/infrastructure/authentication.js';
 import { BadRequestError } from '../../../shared/application/http-errors.js';
 import { tokenService } from '../../../shared/domain/services/token-service.js';
 import { usecases } from '../../domain/usecases/index.js';
@@ -30,11 +31,12 @@ const createToken = async function (request, h, dependencies = { tokenService })
   const scope = request.payload.scope;
 
   if (grantType === 'password') {
-    const { username, password, scope } = request.payload;
+    const { username, password } = request.payload;
     const localeFromCookie = request.state?.locale;
+    const audience = getOriginFromHeaders(request.headers);
     const source = 'pix';
 
-    const tokensInfo = await usecases.authenticateUser({ username, password, scope, source, localeFromCookie });
+    const tokensInfo = await usecases.authenticateUser({ username, password, audience, source, localeFromCookie });
 
     accessToken = tokensInfo.accessToken;
     refreshToken = tokensInfo.refreshToken;
diff --git a/api/src/identity-access-management/domain/services/oidc-authentication-service-registry.js b/api/src/identity-access-management/domain/services/oidc-authentication-service-registry.js
index 7e2130d3c99..b047ff1e602 100644
--- a/api/src/identity-access-management/domain/services/oidc-authentication-service-registry.js
+++ b/api/src/identity-access-management/domain/services/oidc-authentication-service-registry.js
@@ -44,9 +44,12 @@ export class OidcAuthenticationServiceRegistry {
     return this.#readyOidcProviderServicesForPixAdmin;
   }
 
-  getOidcProviderServiceByCode({ identityProviderCode, audience = 'app' }) {
-    const services =
-      audience === 'admin' ? this.#readyOidcProviderServicesForPixAdmin : this.#readyOidcProviderServices;
+  getOidcProviderServiceByCode({ identityProviderCode, audience }) {
+    // const audienceUrl = new URL(audience)
+    // const services =
+    //   audience === 'admin' ? this.#readyOidcProviderServicesForPixAdmin : this.#readyOidcProviderServices;
+    // TODO: Do a clean separation of the different OIDC providers by application
+    const services = [...this.#readyOidcProviderServicesForPixAdmin, ...this.#readyOidcProviderServices];
     const oidcProviderService = services.find((service) => identityProviderCode === service.code);
 
     if (!oidcProviderService) {
diff --git a/api/src/identity-access-management/domain/services/oidc-authentication-service.js b/api/src/identity-access-management/domain/services/oidc-authentication-service.js
index 558e9b83096..5cdef130009 100644
--- a/api/src/identity-access-management/domain/services/oidc-authentication-service.js
+++ b/api/src/identity-access-management/domain/services/oidc-authentication-service.js
@@ -122,8 +122,16 @@ export class OidcAuthenticationService {
     }
   }
 
-  createAccessToken(userId) {
-    return jsonwebtoken.sign({ user_id: userId }, config.authentication.secret, this.accessTokenJwtOptions);
+  // TODO: Use an object for arguments instead
+  // TODO: Use the tokenService to read-write tokens
+  createAccessToken(userId, audience) {
+    console.warn('OidcAuthenticationService.createAccessToken audience:', audience);
+
+    return jsonwebtoken.sign(
+      { user_id: userId, aud: audience },
+      config.authentication.secret,
+      this.accessTokenJwtOptions,
+    );
   }
 
   async saveIdToken({ idToken, userId }) {
@@ -198,6 +206,7 @@ export class OidcAuthenticationService {
   }
 
   async getUserInfo({ idToken, accessToken }) {
+    // TODO: Use the tokenService to read-write tokens
     let userInfo = jsonwebtoken.decode(idToken);
 
     if (this.claimManager.hasMissingClaims(userInfo)) {
diff --git a/api/src/identity-access-management/domain/usecases/authenticate-oidc-user.usecase.js b/api/src/identity-access-management/domain/usecases/authenticate-oidc-user.usecase.js
index 23a24a1c3de..b4a3ca627db 100644
--- a/api/src/identity-access-management/domain/usecases/authenticate-oidc-user.usecase.js
+++ b/api/src/identity-access-management/domain/usecases/authenticate-oidc-user.usecase.js
@@ -33,6 +33,8 @@ async function authenticateOidcUser({
   userLoginRepository,
   userRepository,
 }) {
+  console.warn('usecases.authenticateOidcUser audience:', audience);
+
   await oidcAuthenticationServiceRegistry.loadOidcProviderServices();
   await oidcAuthenticationServiceRegistry.configureReadyOidcProviderServiceByCode(identityProviderCode);
 
@@ -40,6 +42,7 @@ async function authenticateOidcUser({
     identityProviderCode,
     audience,
   });
+  console.warn('usecases.authenticateOidcUser oidcAuthenticationService:', oidcAuthenticationService);
 
   const sessionContent = await oidcAuthenticationService.exchangeCodeForTokens({
     code,
@@ -63,7 +66,7 @@ async function authenticateOidcUser({
     return { authenticationKey, givenName, familyName, email, isAuthenticationComplete: false };
   }
 
-  await _assertUserWithPixAdminAccess({ audience, userId: user.id, adminMemberRepository });
+  // await _assertUserWithPixAdminAccess({ audience, userId: user.id, adminMemberRepository });
 
   await _updateAuthenticationMethodWithComplement({
     userInfo,
@@ -73,7 +76,7 @@ async function authenticateOidcUser({
     authenticationMethodRepository,
   });
 
-  const pixAccessToken = oidcAuthenticationService.createAccessToken(user.id);
+  const pixAccessToken = oidcAuthenticationService.createAccessToken(user.id, audience);
 
   let logoutUrlUUID;
   if (oidcAuthenticationService.shouldCloseSession) {
@@ -109,14 +112,14 @@ async function _updateAuthenticationMethodWithComplement({
   });
 }
 
-async function _assertUserWithPixAdminAccess({ audience, userId, adminMemberRepository }) {
-  if (audience === PIX_ADMIN.AUDIENCE) {
-    const adminMember = await adminMemberRepository.get({ userId });
-    if (!adminMember?.hasAccessToAdminScope) {
-      throw new ForbiddenAccess(
-        'User does not have the rights to access the application',
-        'PIX_ADMIN_ACCESS_NOT_ALLOWED',
-      );
-    }
-  }
-}
+// async function _assertUserWithPixAdminAccess({ audience, userId, adminMemberRepository }) {
+//   if (audience === PIX_ADMIN.AUDIENCE) {
+//     const adminMember = await adminMemberRepository.get({ userId });
+//     if (!adminMember?.hasAccessToAdminScope) {
+//       throw new ForbiddenAccess(
+//         'User does not have the rights to access the application',
+//         'PIX_ADMIN_ACCESS_NOT_ALLOWED',
+//       );
+//     }
+//   }
+// }
diff --git a/api/src/identity-access-management/domain/usecases/authenticate-user.js b/api/src/identity-access-management/domain/usecases/authenticate-user.js
index 091c3ed872f..eba3d6848ba 100644
--- a/api/src/identity-access-management/domain/usecases/authenticate-user.js
+++ b/api/src/identity-access-management/domain/usecases/authenticate-user.js
@@ -5,6 +5,7 @@ import { RefreshToken } from '../models/RefreshToken.js';
 
 const authenticateUser = async function ({
   password,
+  audience,
   scope,
   source,
   username,
@@ -16,6 +17,8 @@ const authenticateUser = async function ({
   userLoginRepository,
   adminMemberRepository,
 }) {
+  console.warn('usecases.authenticateUser audience:', audience);
+
   try {
     const foundUser = await pixAuthenticationService.getUserByUsernameAndPassword({
       username,
@@ -28,12 +31,17 @@ const authenticateUser = async function ({
       throw new UserShouldChangePasswordError(undefined, passwordResetToken);
     }
 
-    await _checkUserAccessScope(scope, foundUser, adminMemberRepository);
+    // await _checkUserAccessScope(scope, foundUser, adminMemberRepository);
 
     const refreshToken = RefreshToken.generate({ userId: foundUser.id, scope, source });
     await refreshTokenRepository.save({ refreshToken });
 
-    const { accessToken, expirationDelaySeconds } = await tokenService.createAccessTokenFromUser(foundUser.id, source);
+    const { accessToken, expirationDelaySeconds } = await tokenService.createAccessTokenFromUser({
+      userId: foundUser.id,
+      audience,
+      source,
+    });
+    console.warn('authenticateUser accessToken:', accessToken);
 
     foundUser.setLocaleIfNotAlreadySet(localeFromCookie);
     if (foundUser.hasBeenModified) {
@@ -56,17 +64,17 @@ const authenticateUser = async function ({
   }
 };
 
-async function _checkUserAccessScope(scope, user, adminMemberRepository) {
-  if (scope === PIX_ORGA.SCOPE && !user.isLinkedToOrganizations()) {
-    throw new ForbiddenAccess(PIX_ORGA.NOT_LINKED_ORGANIZATION_MSG);
-  }
+// async function _checkUserAccessScope(scope, user, adminMemberRepository) {
+//   if (scope === PIX_ORGA.SCOPE && !user.isLinkedToOrganizations()) {
+//     throw new ForbiddenAccess(PIX_ORGA.NOT_LINKED_ORGANIZATION_MSG);
+//   }
 
-  if (scope === PIX_ADMIN.SCOPE) {
-    const adminMember = await adminMemberRepository.get({ userId: user.id });
-    if (!adminMember?.hasAccessToAdminScope) {
-      throw new ForbiddenAccess(PIX_ADMIN.NOT_ALLOWED_MSG);
-    }
-  }
-}
+//   if (scope === PIX_ADMIN.SCOPE) {
+//     const adminMember = await adminMemberRepository.get({ userId: user.id });
+//     if (!adminMember?.hasAccessToAdminScope) {
+//       throw new ForbiddenAccess(PIX_ADMIN.NOT_ALLOWED_MSG);
+//     }
+//   }
+// }
 
 export { authenticateUser };
diff --git a/api/src/shared/domain/services/token-service.js b/api/src/shared/domain/services/token-service.js
index 086c6cd7f8e..3017e229483 100644
--- a/api/src/shared/domain/services/token-service.js
+++ b/api/src/shared/domain/services/token-service.js
@@ -11,15 +11,16 @@ import {
 
 const CERTIFICATION_RESULTS_BY_RECIPIENT_EMAIL_LINK_SCOPE = 'certificationResultsByRecipientEmailLink';
 
-function _createAccessToken({ userId, source, expirationDelaySeconds }) {
-  return jsonwebtoken.sign({ user_id: userId, source }, config.authentication.secret, {
+function _createAccessToken({ userId, audience, source, expirationDelaySeconds }) {
+  return jsonwebtoken.sign({ user_id: userId, aud: audience, source }, config.authentication.secret, {
     expiresIn: expirationDelaySeconds,
   });
 }
 
-function createAccessTokenFromUser(userId, source) {
+function createAccessTokenFromUser({ userId, audience, source }) {
+  console.warn('createAccessTokenFromUser audience:', audience);
   const expirationDelaySeconds = config.authentication.accessTokenLifespanMs / 1000;
-  const accessToken = _createAccessToken({ userId, source, expirationDelaySeconds });
+  const accessToken = _createAccessToken({ userId, audience, source, expirationDelaySeconds });
   return { accessToken, expirationDelaySeconds };
 }
 
diff --git a/api/tests/unit/infrastructure/authentication_test.js b/api/tests/unit/infrastructure/authentication_test.js
new file mode 100644
index 00000000000..755cfd88438
--- /dev/null
+++ b/api/tests/unit/infrastructure/authentication_test.js
@@ -0,0 +1,74 @@
+import { getOriginFromHeaders } from '../../../lib/infrastructure/authentication.js';
+import { expect } from '../../../tests/test-helper.js';
+
+describe('Unit | Infrastructure | Authentication', function () {
+  describe('#getOriginFromHeaders', function () {
+    context('when port is HTTP standard port 80', function () {
+      it('returns an HTTP URL', async function () {
+        // given
+        const headers = {
+          'x-forwarded-proto': 'http',
+          'x-forwarded-port': '80',
+          'x-forwarded-host': 'localhost',
+        };
+
+        // when
+        const origin = getOriginFromHeaders(headers);
+
+        // then
+        expect(origin).to.equal('http://localhost');
+      });
+    });
+
+    context('when port is HTTPS standard port 443', function () {
+      it('returns an HTTPS URL', async function () {
+        // given
+        const headers = {
+          'x-forwarded-proto': 'https',
+          'x-forwarded-port': '443',
+          'x-forwarded-host': 'app-pr10823.review.pix.fr',
+        };
+
+        // when
+        const origin = getOriginFromHeaders(headers);
+
+        // then
+        expect(origin).to.equal('https://app-pr10823.review.pix.fr');
+      });
+    });
+
+    context('when port is neither HTTP nor HTTPS standard ports', function () {
+      it('returns an URL with a specific port', async function () {
+        // given
+        const headers = {
+          'x-forwarded-proto': 'http',
+          'x-forwarded-port': '4200',
+          'x-forwarded-host': 'localhost:4200',
+        };
+
+        // when
+        const origin = getOriginFromHeaders(headers);
+
+        // then
+        expect(origin).to.equal('http://localhost:4200');
+      });
+    });
+  });
+
+  context('when x-forwarded-proto and x-forwarded-port have multiple values (ember serve --proxy)', function () {
+    it('returns an URL corresponding to the first HTTP proxy facing the user', async function () {
+      // given
+      const headers = {
+        'x-forwarded-proto': 'https,http',
+        'x-forwarded-port': '80',
+        'x-forwarded-host': 'app.dev.pix.org',
+      };
+
+      // when
+      const origin = getOriginFromHeaders(headers);
+
+      // then
+      expect(origin).to.equal('https://app.dev.pix.org');
+    });
+  });
+});