Q: auto unlock

Hi

Auto Unlock with Apple Watch is available for Mac models from mid-2013 and later running macOS Sierra.

It may help to check that:

• Your Mac has both Bluetooth and Wi-Fi turned on.
• Your Apple ID is using two-factor authentication (as opposed to two-step verification):
  • Two-factor authentication for Apple ID - Apple Support
  • If you are currently instead using two-step verification, follow the instructions here to turn it off (under "How do I turn off two-step verification?") before enabling two-factor authentication:
    • Frequently asked questions about two-step verification for Apple ID - Apple Support
• Your Mac and Apple Watch are signed in to iCloud with the same Apple ID:
  • On your Mac, choose Apple menu () > System Preferences, then click iCloud.
  • On your iPhone, open the Apple Watch app, then go to General > Apple ID.
• Your Apple Watch is using a passcode:
  • On your iPhone, open the Apple Watch app, then tap Passcode.
• Handoff is enabled on each of your iPhone and your Mac:
  • On your iPhone, go to: Settings > General > Handoff.
  • On your Mac, go to: System Preferences > General - near the bottom, check the option for "Allow Handoff between this Mac and your iCloud devices".
  • If these settings are already enabled, one user found that it helped to disable and re-enable Handoff on their iPhone.
• Note that, once Auto Unlock has been set up, the first time that you log in after having turned on or restarted your Mac, you will still need to log in by entering your password manually. After that, your watch should log in for you.

More information:

Automatically unlock your Mac with your Apple Watch - Apple Support