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Hopefully these steps should get everything back to normal. Restart, then try to re-enable Auto Unlock in System Preferences. Click Open System Preferences, click the lock icon on the bottom left to unlock, and turn on BLEUnlock. If you can’t find the folder, double-check you’re looking in the Library folder within your home folder, not at the root of the boot volume - see the path at the bottom of the screenshot below. This is required to unlock the locked screen. Go to the Library folder in your home folder, open Sharing, then AutoUnlock. Keychain Access AutoUnlock items Delete preferences Some of them might be regenerated shortly after deletion. Now search for ‘autounlock’ and you should see some entries with that name. Keychain Access Auto Unlock application passwords These items are within the iCloud keychain so they are synchronised to other Macs you might also be signed in to, so Auto Unlock will be invalidated and disabled everywhere. If not, skip this step, but if some exist, delete all the ‘Auto Unlock’ items. Search for ‘auto unlock’ and some application passwords should appear. Keychain Access View → Show Invisible Items menu
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If you can’t find the items in subsequent steps, check that this is toggled correctly and not accidentally unset.
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This will show all items in the Keychain, including the entries relating to the Auto Unlock functionality, which would be hidden otherwise. Open Keychain Access.app from the Utilities folder in Applications. Delete preferences Delete Keychain entries
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