I've been unable to login with an Apple ID in the Big Sur guest that is offered at Parallels install time. The error is the same for my normal Apple ID and one newly created from within the guest OS. Logging into iCloud from System Preferences generates a 'Verification error'. All generic stuff and seems to happen a lot with Apple devices. When I log into appleid.apple.com I can see that VirtualMac is a connected device, but I'm not logged into the OS. It feels like an Appel problem but wondering if the VM is causing something to fail?