The WiFi in my hotel room has been dropping video calls so I got a USB C to ethernet adapter and plugged it into my iPad Air 4 running the latest iOS. Ethernet settings appear in the settings app and show an IP address but nothing will connect to the internet.
Apple Support was at a loss so I called the hotel’s internet provider and the agent said she could authorize my device for internet. Great. But she needed a specific address from my iPad. She said it’s a USB key. I have no idea what this means or where to find it in iOS.