Hello,
how can I locate my UDID. I tried with https://udid.io/ but it doesn’t appear when I complete the process. Please help. Thanks
Assuming you have a Mac running a recent macOS.
When you connect the iOS device to Mac, you can see it in the Finder window.
Select the device and click the info line below the device name:
WWDC '21 session 10002 does not seem to be related to your issue. You should better find better tags to get better responses sooner.