As it usually happens, new macOS versions and Xcode versions changes some rules of the game.
In this case, and if you are using Xojo to develop iOS apps, then you need to be aware that Xcode 16 changes the location for the installation of the Provisioning Profiles.
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In previous Xcode releases, these were installed under the path:
~/Library/MobileDevice/Provisioning Profiles -
Starting with Xcode 16, these are installed under:
~/Library/Developer/Xcode/UserData/Provisioning Profiles
So, if you are using a Xojo release previous to the coming Xojo 2024r3, that means that you need to manually move any new provisioning profile from the new path to the old one… but in order that to work, make sure that Xcode is closed; otherwise it will automatically move any new copied profile from the old place to the new place again.