I had a security download (but not yet installed) ready yesterday. Logged off without installing. Turned on my device today and couldnt log in. Checked my pwd 3 times before seeing "authentication service not working " iirc.
After reboot it installed and logging in worked.
Is this related or not and is it expected? Not being able to log in without a mandatory patch first so to say?
MacOS according to other metrics tho. ... https://xkcd.com/1056/