[firebase_auth]: error.credential is null on credential-already-in-use exception during apple sign in in web about flutterfire HOT 3 CLOSED

Hello @BogsBalangat, thank you for reporting this issue. I've just tested the Apple login on the web, and it works without any issues.

Could you please provide a minimal but complete example, or detail the steps that trigger this issue? Additionally, you might try integrating your Apple Sign-In and Firebase with the example app found here to test if the issue persists.

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Hi @TarekkMA, thank you for looking into this. I updated the repro steps and included code to run. The important condition here is that there should already be an existing firebase user linked to the apple account. That is why when the new anonymous user attempts to link the same apple account, firebase auth will throw an credential-already-in-use exception. In this case, the exception should have a non-null credential value which I can use to sign in instead..

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Thank you, @BogsBalangat, for updating the steps required to reproduce the issue. I have been able to reproduce it and created a pure JS example where this issue does not occur. You can view it here: JS Example.

We will look into fixing this issue.

@russellwheatley

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