Problem with approving ads for my site

Hello, first post, but I think it's the right place for that.
My problem:
I'm trying to approve an ad so that it can be posted on my website. I've clicked on the "Approve" link after viewing the ad for reasons of cleanliness. An "Approved Ad" banner will appear at the top of the evaluation announcement page.
However, the announcement will not leave its location and I derive no revenue from this announcement.

I've tried to complete this action several times over the past few days, but without success.

I have a few different ad sites on the pages of my website and I have the appropriate code (as far as I know).
On ad placements, it simply displays the following text:
Your advertisement here
Advertise your products or services in this advertising space.
Please help. What am I doing wrong?

Sincere friendships.