The macOS feature that allows you to unlock your Mac with Apple Watch provides security and maximum comfort. However, a problem may arise if the function stops working properly.
If unlocking your Mac with Apple Watch doesn't work for you, here are some solutions you can try.
The most common problem with this feature is that the indicator spins for a couple of seconds, but does not unlock the Mac, and eventually a sign requiring a password is displayed. In this situation, solution # 8 is fine. You may have other cases, but one of the solutions should definitely help.
How to fix Mac unlock problems with Apple Watch
Solution 1: check that you entered your Mac password exactly when booting.
After enabling unlock Apple Watch, you still need to enter your password if you restart your Mac. This is not a bug, it is a specially designed security measure. Each time you restart your computer, you first have to enter the password manually. After that, if your Mac goes to sleep, you can unlock it with Apple Watch.
Solution 2: check that you entered your password correctly Apple Watch.
Like the Mac password, the password for Apple Watch will also need to be entered manually first. This is also a security measure designed to ensure that no one else can unlock your Mac.
Solution 3: turn the feature on and off.
On a Mac, go to > System Preferences> Security. Select the General tab, then uncheck and check the box next to Allow Apple Watch to unlock your Mac.
Solution 4: check that you are logged in on both devices to the same account.
On a Mac, go to > System Preferences> iCloud and check that the account here is the same as on Apple Watch in the Watch app> General> Accounts.
If the account does not match, you will not be able to use the unlock function.
Solution 5: check that Bluetooth and Wi-Fi are turned on on the Mac.
Bluetooth and Wi-Fi must be turned on to transfer information. If they are disabled, Apple Watch will not be able to connect to the Mac to unlock it.
Solution 6: check that Internet Sharing is turned off on Mac
On a Mac, go to > System Preferences> Sharing and check that access is disabled.
Solution 7: Make sure Apple Watch is no more than an arm's length from the Mac.
This is understandable, but you still have to be near the Mac to unlock it for hours.
Solution 8: reboot everything.
If all else fails, just restart your Mac and Apple Watch. You may need to reboot your Mac more than once for the feature to work properly.