Crashlytics found an invalid API key - AndroidStudio build

Question

I saw all other questions, but none of accepted answers is working for me.

By following integration steps found here https://dev.twitter.com/twitter-kit/android/int

Answer 1

I also experienced this issue and it took a while for me to realize I forgot adding the following line into the app/build.gradle:

apply plugin: 'com.google.gms.google-services'

After adding it, it started working like a charm even without in manifest and/or app/fabric.properties file.