Apple Watch not unlocking iMac
Apple Watch has just stopped opening my Mac; checked security on Preferences and "Allow Apple Watch to unlock Mac" unchecked. So Unlocked to allow change and when checking the Allow watch to unlock Mac, received message "your Apple Watch must be signed into iCloud to allow it to unlock your Mac". OK, so Watch is already signed into iCloud and into the same Apple ID; and keep in mind it was working OK yesterday. Any suggestions how to get this back. Incidentally this has happened before and I had to sign out on my Apple ID and back in (Big mistake) it then took nearly a week to get my desktop back to recovery from iCloud.
Apple Watch is Series 6 Version 9.6.3
Mac is Monterey Version 12.7
iMac 27″, macOS 12.7