Solution if Apple watch is not opening your Mac

Recently my Apple watch stopped opening my MBP. After some investigation I found the solution on Apple’s support site. This solution worked for me. I thought I’d pass this along to save others time if they run into a similar problem.

  1. Open “Keychain Access”
  2. In “View”, enable “Show Invisible Items”
  3. Search for “Auto Unlock”
  4. You should see a whole bunch of application passwords for “Auto Unlock: XXXX’s …”
  5. Select all records and delete (this will reset/disable auto unlock on other Macs if you use multiple Macs)
  6. Whilst still in “Keychain Access”, search for “AutoUnlock” (no space)
  7. There should be 4 entries for “tlk” “tlk-nonsync” “classA” “classC”
  8. Select 4 records and delete (don’t worry if they re-appear, the system repairs this automatically)
  9. Open “Finder” and navigate to “~/Library/Sharing/AutoUnlock”
  10. There should be two files “ltk.plist” and “pairing-records.plist”
  11. Delete both files
  12. Open “System Preferences” and try enabling auto unlock. You may need to enable it twice, the first attempt will fail.
  13. Shut down and restart the computer
1 Like

Already on site :slight_smile:
Unlock with Apple Watch on Big Sur - Tech Support - MPU Talk (

ooops, “I” should have check MPU first! I’ll delete this post. Thanks for letting me know!