Guest checkout fail

[valerio-fornace]

Hi everybody! Checkout works perfectly with paypal user after login.
But if i try to do a guest checkout i have infinite loader without any errors in the end.
Before i filled all forms, add notification codes from nexi and in the end the paypl webview show the loader and stuck in it.
I try to inspect and it seems that webview redirect in genericError url.

Someone can help me to understand why?