I can try. My problem was completely fixed by doing the following. first, I would recommend that you upgrade to 16.5.1. I think Apple might have fixed the Bluetooth issue it created with 16.5 with the recent release of 16.5.1. So, first upgrade to 16.5.1. Then, #1 turn off your hearing aids and re-charge them. #2 go to Settings on your I-Phone and turn off WiFi and Bluetooth (turn off both). Then go to Privacy and Security and scroll down to the Bluetooth link. Click on that and turn off the access your granted your hearing aids (mine are Signia so I scrolled down to find Signia and turned them off. #3. turn off your phone. #4 put your re-charged hearing aids in your ears and turn on your phone again. #5 reverse all of the things you did to turn off WiFi and the Bluetooth....turn them all back on again. #6 "Pair" your hearing aids again....you do that by clicking on Accessibility in Settings and then scrolling down and clicking on Hearing Devices. It will ask you if you want to "pair" your devices and just click on that.
If you do this your hearing aids should be "paired" with your I-Phone and should work perfectly from that point on. But, please upgrade your I-Phone to 16.5.1 before beginning the whole process. I did as I described above and my hearing aids work perfectly with my I-Phone again. Good luck!!!