Trying giving a little more time. I completed an Ironsource offer a couple days ago where I had to reach a certain power on another app. Once I did it, Ironsource said that the offer was completed and that platinum had been awarded even though it had not. It was probably around 12-18 hours later when the platinum actually hit my account.

If even after waiting it’s not working, send them an email with proof (screenshots) of you completing the offer and let them know you were never rewarded.