Found a workaround (which I hate to even think about, thanks Apple!)
Restart and at the very first screen for language choose yours and hit
CTLR+OPT+CMD+T to get the root terminal, then: sudo profiles -N Setup
the keyboard and now the management scre...
Also, I noticed the above terminal command works if you restart and get
all the way back to the first language screen (before _mbsetupuser takes
over) and can run as root.
Same issue here. Noticed an increase in reports about this from IT in
the last day or so and even experienced it on a new test. Does anyone
have a case number with Apple we can track?