Hi, I can have valid values even on iOS 14.4. Unfortunately the access point has a sort of fade in animation you can't control, it's quick but until it shows completely it always returns 0. The visible property doesn't work, it always returns false, there's another forum post about it and Apple never replied. So you should just wait and check the height or width of the size as well as the X and Y of the origin till you get values greater than 0. It's the only way I found it works.

I'm having the same issue and sad to see there's no reply from Apple....