Setting up/registering my device for testing requires a UDID [Certificates | Devices |iPhone]. According to various Apple support pages, that is supposed to be on the Settings/About screen, but with 10.2 that's no longer the case.
What in the world it is hard to find out my Apple devices's UID. I've Apple iPhone 12 and I've macBook Air (2017), the cable is Type C and there is no such port. Apple's monopoly sucks, one side they say they wants to be eco-friendly and other side they are making us spend extra bucks on buying connectors, adapters.