Yes issue came back for me last night as well
New build just went out to address it I believe. Turns out this one wasn’t M1 specific only but authenicator specific. Didn’t have to wait 2 months either since it affected windows too 
I was able to log in if I started with Battle.net, but not if I tried to launch WoW directly.
Just moving from Intel MBP to Apple Silicon. Do I have to download a new copy of WoW specific for the Apple Silicon, so it does not run under Rosetta?
Activity Monitor says everything is running under Intel.