You need provisioning profiles, and that should be so. But I emphasize that I should, because it is not easy for me to return him to work. I suspect that access to Keychain Access is a mistake (but donโt quote me, I canโt prove it).
Some copy-keys-and-certificates-restart-xcode-reboot-device-madness operations later just worked for no apparent reason. After a clean installation, you can definitely use old keys, certificates, and profiles.
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