firebase_ui_auth package SignInScreen error: "This provider is associated with a different user account."

[Edvard-D]

Hey all!

I'm using the firebase_ui_auth Flutter package, and the SignInScreen that is part of that. I'm planning on offering Google, Apple, and email/password login options. As a test, I logged in with a non-Gmail Google account using the Google authentication option. This seemed to work perfectly. I then logged out, closed the app, and reopened it.

Now, something important to note is that I'm creating a new anonymous account right when a user opens the app for the first time since I want people to be able to try my app without creating an account, and I need a user ID to reference in the backend as the user goes about trying out the app.

So, back to the issue. I reopened the app, at which point a new anonymous user account was created. I then tried logging back into my account using the same Google authentication option as I did before. At no point did I try creating or logging in with just the email; I only ever used the Google authentication option. When I did, I received the following error: This provider is associated with a different user account.

Now, I've tried searching this error to see how to resolve this but unfortunately there doesn't seem to be anything out there about it (that I could find, at least). Does anyone know how I can go about resolving this issue?