“The features requires an Apple Watch with watchOS 3 or later (which we had), and macOS Sierra (which we had) running on a mid-2013 or newer Mac (we had a 2012 Retina MacBook Pro),” Wuerthele writes. “Plus, there’s a new requirement. If you have a Series 3 Apple Watch, your Mac must not only be mid-2013 or newer, but must also be running High Sierra.”
‘Obviously, auto log-in on your Mac must be disabled and a password must be set. If you haven’t set one, best passcode practices suggest it not be the same as your connected iPhone’s,” Wuerthele writes. “Your Apple Watch must also have a passcode —otherwise the whole procedure fails.”
Much more in the full article here.