emailLinkSignIn not working

When setting `firebaseAuthConfig` (to be given to `StyledFirebaseAuth`), if `emailLinkSignIn`
is set and `url` inside it is defined, the sign-in is not successful, in the sense that clicking the email link won't sign the user in (and the `signInSuccessWithAuthResult` callback is not invoked --- this is where I set cookies and only if the cookies are set can a user be identified as having signed in). If I don't set `emailLinkSignIn` then everything is working fine.

What could be the problem, and how could it be fixed?

P.S. Just a note that when I have `emailLinkSignIn` set, I do see the `url` is visited but somehow the sign-in is not successful.

Another note: if I'm already signed-in, then including `emailLinkSignIn` and going through a new sign-in (an email is entered, the link is clicked) will send me to the `url` inside `emailLinkSignIn` successfully.

Updated: I've found out that if `url` points back the `auth` (it's where I ask for the emails) then it will be a success. I don't understand the current behaviour or if I'm using it correctly. Any help will be appreciated.

Thanks!

Start at the StyledFirebaseAuth entry point and reproduce the flow with firebaseAuthConfig.emailLinkSignIn.url set, comparing it with the working configuration without emailLinkSignIn. Trace whether clicking the email link invokes signInSuccessWithAuthResult and confirm that the user is signed in and redirected to the configured URL.

Written by the indexing model from the issue text.