APK cannot install

Question

Our app, used to work. The last update published 2 and a half weeks ago when the apk file created and worked properly.

The last 2 days when we are trying to create

Answer 1

I fixed that the same which mentioned above, by applying v1 signing only and turn off v2 signing, moreover that can be done through gradle build file by settings value for v1SigningEnabled & v2SigningEnabled as the following:

signingConfigs {
    staging {
        keyAlias *****
        keyPassword *****
        storeFile file(*****)
        storePassword *****
        v1SigningEnabled true
        v2SigningEnabled false
    }
    release {
        keyAlias *****
        keyPassword *****
        storeFile file(*****)
        storePassword *****
        v1SigningEnabled true
        v2SigningEnabled false
    }
}