I'm trying make firebase auth using email/password and Google auth. Email/password login works fine but I'm having an issue about one email per account. After I sign up with email/password, and try to login with Google auth, then errors should appear about saying "auth/email account -already in use", but instead, it just logs in like normal behavior.
I'm very confused. I was going to make account link to same email account but I'm not sure what to do next since this weird behavior happened. I will be sooo great if someone explain it to me about this issue. This is based on React.js and React-router and firebase.
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Frank van Puffelen
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Ronny
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Does this answer your question? [Check if given email exists](https://stackoverflow.com/questions/40093781/check-if-given-email-exists) – Aziz Sonawalla Nov 20 '20 at 03:59
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Google Auth is Gmail and hence has a "higher authority".
If you can sign-in with your Gmail/Password, you are identified as the email address owner, and hence have the authority to login to your firebase account.
If you try to sign-in with Facebook, after you sign up with email/password, you will get the error "auth/email account -already in use" which you want to see.
This is the correct firebase behaviour.
Someone Special
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