make sure SHA1 are the same in both cases:

1. your app in debug mode

2. your app in release mode

check in cmd using command:

keytool -keystore <path-to-debug-or-production-keystore> -list -v

then enter the password for keystore

check in your app by using command:

plugins.googleplus.getSigningCertificateFingerprint(sha1 => console.log(sha1))

compare both results and add both SHA1 in firebase for debug and release