Touch screen noise during calls on my iPhone

When on a call/facetime the other person hears a very loud noise every time I touch my iphone screen (silent at this end). Tested with video and also picks up touch screen noise when recording. I have listened to a call recording and it sounds like I am slamming my microphone into a hard object with every audibly silent tap on my screen. This is not ok.

Another recent thread with same subject line went dead with 47 people reporting they have the same problem, with no one reporting a solution.

It seems to be commonly reported on iphone 12 pro and pro max phones. From one response they replaced microphone 3 times and it did not fix it, so I am worried it is the touch screen itself causing the problem, and wondering now if this is a screen defect in the iphone 12 pro line, given the lack of solutions posted.