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Level 1
Hard to say what your issue is to be honest @lygiapearl. In my game I lost my adverts in March and they have just last month reappeared. Now that I have them back they seem to come and go. Sometimes they appear multiple times in a day and on days they don't appear at all. Maybe this is just normal for adverts nowadays, but I can't be sure as King do not provide us with any detail on how they run things,
Sadly there is also the possibility that you have lost your adverts for good. This is another thing that King does as no feature should be considered a permanent part of anyone's game.