If Apple Watch cannot open Mac and/or Sidecar doesn't work over WiFi after upgrading to the Big Sur sign out of AppleID and sign in back will fix it.
I had trouble with unlocking with apple watch after the upgrade - the same "watch not communicating.." message. I unpaired and re-paired the watch and rebooted which fixed it. Then I installed avira anti-virus and once again the watch wouldn’t unlock so I uninstalled the anti-virus and the watch worked again. Does anybody know an AV app which will work with apple watch unlocking?
Do you sign out of your Apple ID on the Mac or the iPhone that the Apple Watch is connected to (or both the Mac and iPhone)?
Apple really need to take action on this. I tried all proposed solutions above, none work.
none of the above fixed this issue for me. watch still wont open imac
Work it! thank's so much!
I've tried many solutions for this "Your Mac was unable to communicate with your Apple Watch." issue, like deleting 'Auto Unlock' stuff from the Keychain Access, turning off/on Keychain in the iCloud settings, signing out/in from my Apple ID on my Mac… but these tricks did not solve it for me.
Finally I unpaired/paired my Apple Watch and the "Use your Apple Watch to unlock apps and your Mac" option worked (after checking the checkbox twice). Pfhew…
I could "repair" the unlock problem by decoupling the watch from my iPhone and coupling again.
Thank you!
Confirm that signing out of AppleID on Mac and signing back in fixed it. It took a few unlocks for it to "stick," but eventually it worked again.
When you signed out of your Apple ID, did you keep a copy of the iCloud data on the Mac prior to signing out?
The Apple ID sign out/sign in didn't do the trick for me. But the unpairing/pairing option worked to make it function again.
Thanks - tried all the other "fixes" but this is the only one that worked!
Apple Watch cannot open Mac and/or Sidecar doesn't work over WiFi
