Why, after generating a signed APK, did authorization through social networks stop working? networks (Vkontakte, Facebook, google)?

Question

Android

During the normal assembly of the application, everything works fine, and when generating a signed file, authorization falls off, as if the keys had gone somewhere or changed.
Assembly:

lintOptions {
        disable 'MissingTranslation'
    } 
buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            proguardFile 'C:/android/key.jks'
        }
    }

proguard-rules:

-dontwarn com.google.android.gms.internal.zzbdo
-dontwarn okio.**

What is the reason, how to fix it?

Answer 1

the reason, most likely, is that the proguard saws off things that are unnecessary in his opinion. add exceptions.

Answer 2

Perhaps in the login settings via social networks you have SSH1 keys from the wrong keystore.