Apple Watch not unlocking Mac I have an Apple Watch Series 3 and MacBook Pro 2017.  I tried pairing my Apple Watch to my MacBook and it worked, but I can't use it for login.  I can only use my Apple Watch to authenticate within apps (ie. in the security tab of system preferences, I can click the lock icon and unlock it with my Apple Watch).  I can't use my Apple Watch to unlock the MacBook.  Does anyone know how to fix this?
Well I thought I figured it out, but it stopped working shortly after.  So after much troubleshooting, I really did figure it out.  Wifi has to be enabled on the Apple Watch for the unlock to work.
It's funny that none of the apple support documents say that.  I just use bluetooth on my watch, so I tend to keep Wifi off.  When I reset my watch, Wifi was automatically turned back on, which would explain why it worked for a while.