Hi, Im experiencing a similar situation.
I've a small game developed in Godot, published on both play store and App Store. Everything works fine on android. iOS on the other hand only works if user approves the gdpr/att, if not I get error message "No ads to show".
I've tried following several guides and troubleshooting helpers but with no result, would much appreciate to get help figuring out why I won't get ads on iOS if user won't agree to gdpr and/or apple tracking transparency.