@OmegaStarScream i had the exact same problem a few months ago, tried every possible solution i could think of, but nothing worked, i gave up and closed that ad account and opened a new one.
my guess is the problem is from the ad account, try opening a new one if you don't manage to fix this some other way
I had another ads account but that didn't work on its own. I don't believe there were any issues with my card either, but when I tried a combination of both a new account, as well as a new card. It worked like a charm.
Thanks for the suggestion. Did this ever happen to you in the new account? I mean should I expect it to happen again, or do you have an idea as to what might have caused it in your case? In my case, I don't believe I was doing anything considered "suspicious" as per their terms. Just running ads casually, nothing too expensive either.