Hi ,
It’s SHA1 PROBLEM .
when you create Google authclient id in googel developer console that time use SHA1
For debug mode testing time use debug keystore key store in c/user/username/. Android/ debug.keystore use this keystore file and get your SHA1 key
For signing apk , use your signing keystore SHA1
For playstore , use
Open your playstore login
In release management >app signing in find playstore certificate and use playstore sha1 and create ionic Google plus login it will work perfectly
In ionic signing in apk use different Sha1 and certificate and for playstore, use signing in certificate it will generate automatically new certificate. It will show you in playstore admin panel. It’s work for me . For other details read ionic Google plus login readme.txt file in this they explain all things