Had the same problem for 2 Weeks now! After opening a ticket last week which didnt even received a reply so far, today I copied my existing campagne, deactivated the existing one and fumbled around the copied, made sure the bidding strategy is activated and on status "learning" I finally get impression and clicks.
Cant tell if the account was shadow banned or now. Not MCC. Comletly new google ads account.
Hope that helps somebody
Cheers