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Fixing Using Apple Watch to Unlock Mac problems

Since 2013, compatible Macs can be conveniently unlocked with an Apple Watch. However, this feature sometimes suddenly stops working. There are web pages that have solutions, but these are no more than reprinting Apple’s support pages.

When my watch stopped unlocking, I was unable to reactivate it. The Mac displayed an error “unable to communicate with watch” error. The typical answer is toggle handoff, but I found that I fixed this by simply unchecking “Require Password…”. This then allowed me to activate Allow watch to unlock again.