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You might find these pages helpful:
https://firebase.google.com/docs/auth/unity/account-linking
https://firebase.google.com/docs/auth/unity/anonymous-auth

The recommended flow is that:

• the user is signed in with an anonymous account
• you ask the user to authenticate with a google account (or other authentication method) to get a credential
• while still signed into the anonymous account, call auth.CurrentUser.LinkWithCredentialAsync(credential)

The expectation is that one firebase user can have multiple associated authentication methods. It should still be the same firebase account.

Let me know if you need any more information.

Thank you for replying.
If I understood correctly, LinkWithCredentialAsync() will link google account and anonymous account together, so that means Current User ID won't change and will remain the same when given by anonymous account. Correct?

What if user uninstalls the app and later decides to reinstall. He will be signed in with a new fresh anonymous account and if he tries to link his same Google account, it will be linked with the recent newly anonymous account and not old ones right?

So he won't be able to get old in-game currencies back previously stored in google account and will be overwritten by in-game currency values stored in new anonymous account.

If I understood correctly, LinkWithCredentialAsync() will link google account and anonymous account together, so that means Current User ID won't change and will remain the same when given by anonymous account. Correct?

Yes, this is correct.

What if user uninstalls the app and later decides to reinstall. He will be signed in with a new fresh anonymous account and if he tries to link his same Google account, it will be linked with the recent newly anonymous account and not old ones right?

So he won't be able to get old in-game currencies back previously stored in google account and will be overwritten by in-game currency values stored in new anonymous account.

If the user previously linked a google account to their account, then in the future they should choose to sign in using the google account instead of trying to link it again.

I'm not sure exactly what would happen if the user tried to link the same google account to multiple different accounts, but I suspect that the second attempt to link would fail.

Hey @JaineshPathak. We need more information to resolve this issue but there hasn't been an update in 5 weekdays. I'm marking the issue as stale and if there are no new updates in the next 5 days I will close it automatically.

If you have more information that will help us get to the bottom of this, just add a comment!

Since there haven't been any recent updates here, I am going to close this issue.

@JaineshPathak if you're still experiencing this problem and want to continue the discussion just leave a comment here and we are happy to re-open this.