This is rather hair-pullingly frustrating, as I've been using Parallels on Macbooks since Parallels 11 without ever experiencing this problem.
As I replaced my Intel MB Pro 2019 with an MB Pro M4, I needed to start over with my migration. But connecting my iPhone 13 Pro to Parallels 20.1.3...
For those of you who have had USB 3 trouble in PD 17.1, I must say that the USB setup is MUCH better in PD 18. My ability to use Dragon and Philips Speech Mike Pro software was improved substantially by PD18. I have been beta testing for a while and have a decent amount of time to test...
I tried e.g with a CP210x USB TTL Adapter. The device manager in Windows shows it for a second, then disappears, then again.
So it is more or less blinking ;-)
Guess it is a Parallels USB thing, or am I wrong?
Thanks