I am using firebase phone auth in flutter android. I have uploaded App signing key certificate's SHA-256 key, upload key certificate's SHA-256, developer's PC SHA-256 key.
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Did you try in real device?? – Dhruvil Patel Apr 19 '23 at 07:21
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Yes, the app is in production and tested on real device – Gautam Bhateja Apr 19 '23 at 09:35
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I am still in debug and didn't upload yet to store, just saw a note that you need to have a recent version of firebase auth package.
Make sure you have it.

blackgreen
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