Unlocking Macbook with Apple Watch

Update to watchOS 7.2

If that does not work, it should, but if it does not work, then read the following threads

Check out this thread on fixing Apple Watch unlocking Mac

https://discussions.apple.com/thread/251803595?answerId=253458029022#253458029022

Then follow with this thread

https://discussions.apple.com/thread/251826134?answerId=253504359022#253504359022

And

I also found that it took awhile for the iCloud Keychain records to propagate and merge on all the systems. More so when you have multiple devices sharing the keychain (I have 4 Macs, the iPhone, and the Apple Watch). I followed both of the above threads, but it was not reliably working until the next day, when I tried again. And I did have to click the enable check box twice the next day, but then it stuck.

And this thread says they also had to toggle the Apple Watch -> Settings -> Siri -> Listen for "Hey Siri" option off then on

https://discussions.apple.com/thread/251803595?answerId=253782332022#253782332022

Hints (you will understand when you read the first and second threads):

Applications -> Utilities -> Keychain Access

Finder -> Go menu -> ~/Library/Sharing/AutoUnlock

System Preferences -> iCloud -> Keychain

Hey viral5,

It sounds like you're having some issues with Auto Unlock for your Mac and Apple Watch. We can understand wanting to get that resolved. We want to help.

First, we'd recommend checking for and installing any updates that may be available for your Mac and Apple Watch:

How to update the software on your Mac

Update your Apple Watch

We'd then recommend restarting all of your devices, including the iPhone that's paired with your Apple Watch to see if that helps.

W'ed also suggest ensuring your password meets the requirements for Auto Unlock.

 Auto Unlock supports the use of the following characters in the your user password:

• Uppercase or lowercase letters A to Z
• Numbers 0 to 9
• Underscores
• Hyphens
• Periods

If any characters other than these are used in the password, change your password in System Preferences > Users & Groups to a password that only contains these supported characters, restart, and test.

Thanks!