SignUpButton fails to authenticate user if Facebook account was previously linked

[gabrielmaldi]

Preliminary Checks

• I have reviewed the documentation: https://clerk.com/docs

• I have searched for existing issues: https://github.com/clerk/javascript/issues

• I have not already reached out to Clerk support via email or Discord (if you have, no need to open an issue here)

• This issue is not a question, general help request, or anything other than a bug report directly related to Clerk. Please ask questions in our Discord community: https://clerk.com/discord.

Reproduction

https://app.replay.io/recording/localhost3000--a6a7a2fd-696d-43ef-b216-ce4c9f3114df?commentId=&focusWindow=eyJiZWdpbiI6eyJwb2ludCI6IjAiLCJ0aW1lIjowfSwiZW5kIjp7InBvaW50IjoiNTg0MTMzMzk2NjUwOTU4NTM2MjQwNzE2NDEzNTYwNDIyNCIsInRpbWUiOjM2OTB9fQ%253D%253D&point=324518553658633099732480646185098&primaryPanel=tour&secondaryPanel=console&time=133&viewMode=non-dev

Publishable key

pk_test_Z2xvd2luZy1iYXQtOTguY2xlcmsuYWNjb3VudHMuZGV2JA

Description

Steps to reproduce:

1. Use <SignUpButton mode="modal">
2. Select Facebook:

3. Make sure you had already signed-up using Facebook (so this is conceptually a sign-in really) and select Continue:

Expected behavior:

The user is taken back to the site and is now logged-in.

Actual behavior:

The user is taken back to the site but is not logged-in.

The URL is http://localhost:3000/#/sso-callback and these are the requests:

Everything works fine if I use <SignInButton> instead, or if I select Already have an account? [Sign in] in the sign-up modal (before selecting Facebook):

In those cases, these are the requests:

The one I highlighted seems to be the one making auth work. And the final URL is http://localhost:3000/ (no /#/sso-callback).

I'm not using either of: NEXT_PUBLIC_CLERK_AFTER_SIGN_IN_URL, NEXT_PUBLIC_CLERK_AFTER_SIGN_UP_URL, forceRedirectUrl, signInForceRedirectUrl, signUpForceRedirectUrl.

My reasoning is that since if I first select Already have an account? [Sign in], everything works, then this is probably a bug in SignUpButton.

Thanks

Environment

System:
    OS: macOS 15.2
    CPU: (11) arm64 Apple M3 Pro
    Memory: 77.48 MB / 36.00 GB
    Shell: 3.7.1 - /opt/homebrew/bin/fish
  Binaries:
    Node: 22.12.0 - /usr/local/bin/node
    Yarn: 1.22.22 - /opt/homebrew/bin/yarn
    npm: 10.9.0 - /usr/local/bin/npm
    bun: 1.1.39 - ~/.bun/bin/bun
    Watchman: 2024.12.02.00 - /opt/homebrew/bin/watchman
  Browsers:
    Brave Browser: 131.1.73.101
    Chrome: 131.0.6778.140
    Chrome Canary: 133.0.6901.0
    Edge: 130.0.2849.56
    Safari: 18.2
    Safari Technology Preview: 18.2
  npmPackages:
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