I'm currently seeing similar errors "Account Temporarily Unavailable" (1028/2011); "Account temporarily unavailable due to bad or missing auth token" in Xcode 13 when running a macOS CloudKit app. This happens on two different Macs with macOS 12 beta 4. CloudKit account is 'available', but all syncing operations fails with this error. The same app downloaded from the Mac App Store runs and syncs without errors. Update: I'm also sometimes seeing this error: "Not Authenticated" (2011); "User rejected a prompt to enter their iCloud account password".

My CloudKit enabled macOS apps are suffering from exact the same error message when running macOS 12 beta 4. This happens on 2 different Macs running the same beta. As if developing for Apple is not already challenging enough.