Firebase Authentication Is Failing With "developer Error" After Uploading Apk To Google Play Store

I am using Firebase Authentication for authenticating user in my application. Everything was working fine till I was working on debug build of my application. But the moment I have

Solution 1:

Open App signing section in Google Play Console, and get SHA1 of app signing certificate

Solution 2:

if you are using local .jks file for signing, you dont need to google play app signing. after adding your .jsk file's fingerprint into firebase console. just sync it in android studio or try to run the app on your phone first after that build a new signed apk. Then upload it on playstore.