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How can I know if the user is signed in to the application for the first time or not?

There was a similar question.

Check if user is authenticated for the first time in Firebase Google Authentication in Android

But I don't know how to do it when using Unity&c# as development tools.

hollowha
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  • How about this https://stackoverflow.com/a/70012470/10323242 – kdw9502 Jul 27 '22 at 09:30
  • Thx! It works well. But there's a small problem when I am testing. After I delete an account from Authentication section of the Firebase console,I can't create the account again. Overall, you solve my main problem~very appreciate. – hollowha Jul 28 '22 at 08:04

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