Have you get it solved? Met the same issue while trying to build Vision Pro sample project to device.

Thank you. Finally problem solved. Xcode, open the unity project, I didn't notice that the Signing&Capabilities page was empty. I need to add any other device on the general page and remove the apple vision and add it back then I can see options on the signing&capabilities page then I have the apple account and team set. After this set the Vision Pro is on the run to list. Run to Device on Unity, since we have to use local network, I can't run the host from TestFlight which asking for internet connection. Instead run the host by clicking the icon on desktop works (no complaining about internet)