PlatformException(sign_in_failed, com.google.android.gms.common.api.b: 12500: , null, null)

well I struggled with tis error and tried everything but none worked
I manage to solve this problem so I want to tell you all in case someone has the same situation as me,

I requested an app signing update and after the update I add the SH1 to my app, and the app was working with debug but not relase so I had to add the old signing SH1 as well so it worked

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