I have seen so many people who have this problem and write on the forms of kodular Appybuilder etc … writing your problem here or elsewhere is totally useless.
I have had this problem for about 2 months, if you have the same problem, I advise you to write your problem here: Ads not showing but Test ads shown properly and also request are made but no impression.Please help. - AdMob Help
With this method we will let Admob know that there are so many users who have this problem.
Thank you.