So, I ended up visiting the M1s physically and upgraded them to macOS
12.6, and unchecked/rechecked Remote Management under System Preferences
-> Sharing and now the problem has gone away. Curiously enough though,
when I try to use the Lock Screen fe...
I have the same issue but don't use MDM. My ARD source iMac is intel
running macOS 12.6; My ARD target is M1 running macOS 12.2.1; When I try
Observe or Control, all I get is a black screen, but ARD shows that the
computer is on Login Window.