I can't lower the target sdk to 29 because it's the new requirement from google play(Target API level 30 (Android 11) or above) Has anyone had the same issue?
No issue with target 29 and play-service 12
implementation 'com.google.android.gms:play-services-ads:12.0.1'
Play-services-ads version 12 is a bit old(released 3 years ago), it's possible that API-29 to 30 update deprecated & removed some stuff that makes version 12 work, you will probably need to update to a later version of ads(19-20 are the most recent ones as of this moment).