After this morning I've update Android SDK, the same application that yesterday goes ok in compilation ... today do not compile! This, in Debug ad Release mode.
I use FirebaseAnalytics.GooglePlayBase, FirebaseAnalytics.Firebase, FirebaseAnalytics.FirebaseAnalytics & FirebaseAdMob.FirebaseAds together along with Crashlytics & have no problems, so if it is a conflict it might be in the Auth, Notifications or RemoteConfig libraries.
Oh - are you using DonManfred's Firebase RemoteConfig library? If so, I don't think you need the
B4X:
#AdditionalJar: com.google.firebase:firebase-core
because I read in the library thread that he added the @DependsOn to the library.
Sorry - I didn't read your first post properly. You've had similar issues at least once before after updating the SDK, so you probably need to make sure that all the Firebase components were updated properly. To refresh your memory, you might want to refer back to this thread -> https://www.b4x.com/android/forum/threads/crashlytics-error.96906/
Btw - I have FirebaseAdMob & Core running in multiple apps with no problems. It's probably that one or the other of those components hasn't been updated properly.