I don’t know whether there are reports of this problem starting to surface, but it took four calls to Apple Support before I finally reached someone who said: “It is a system-wide problem, we will let you know when we have a solution.”
I have a six-month-old Apple Series 5 watch (with cellular and GPS) which for the first five months of its life was consistently and regularly unlocking my 15” Retina MBP with Touch Bar. Suddenly - that stopped working. I was too busy to look into it immediately, but finally started trying to track it down this past Monday. First call was dispatched to a watch specialist, who had me delete all content and restore from backup.
That actually took two calls (a call and a call-back) since the restore took two forevers. Third call went to a lady who was clearly in over her depth, she couldn’t even answer simple watch interface questions (What does it mean when the dot over the 12 o’clock pip turns green? What dot, is it glowing?) I got impatient and broke off the call, my mistake - I should have asked for second level support. I called a forth time, and finally talked with someone who put me on hold while they talked to second and third level support. The final answer was what I reported above - and I’ve been promised a call-back next week, with at least an update.
Of course, in the meanwhile, I’m unlocking with the finger print reader, which isn’t too reliable on my ancient dry skin.
Sure would appreciate anyone else with similar issues confirming my experience (with the watch, not with Apple support, which in general has been excellent).