You might have to leave the game open for a few minutes for it to work.
Sometimes I'll have to play an in-game day before my ads will work
#Advertising
shadow hearth
Try reseting your advertising ID - it can be found in your phone settings
Or I guess it might be a bad internet connection.
shadow hearth
Hmm I'm not sure what else it could be
shadow hearth
Ohh, that is quite unfortunate 😕