I had to replace my iPhone X, my hearing aids worked perfectly on it. I bought an iPhone 11 temporarily while I waited for the iPhone 12 Pro, my hearing aids worked perfectly on it with ios14.1. I received the iPhone 12 Pro and I had immediate problems with white noise crackling with everything, emails, Facebook, Gumtree, YouTube, BART emergency services app, messenger. I have installed iOS 14.2 and there is no difference. I will be hard to convince that it is software that is the problem. I reckon it’s hardware and will require a repair or replacement.