updated firebase version solved the issue, as with previous it was picking 20.2.2 that was causing the app to crash.

Author: gonzalonarbaiz

OneSignalSDK/onesignal/build.gradle

@@ -5,7 +5,7 @@ ext {
 
     androidXVersion = '[1.0.0, 1.99.99]'
     androidWorkVersion = '[2.0.0, 2.99.99]'
-    firebaseMessagingVersion = '[19.0.0, 20.99.99]'
+    firebaseMessagingVersion = '[19.0.0, 21.99.99]'
     googleGMSVersion = '[17.0.0, 17.99.99]'
 }