A common Anti-Cheat workaround is to set anti-cheat files to read-only to enable the anti cheat to work but disable accidental corruption via misaligned syscalls. However, this doesn't appear to work in this case. Tried ...
I was able to play 2 raids. Upon exiting the two raids, I got the popup that @scelusnet mentioned above. But now, I can't log back in anymore. It just always pops up the dialog and exits the game...
PUSH, PUSH, PUSH does not work for me either got the same problem, there are some people on proton claiming its working for them but with heavy artifacts.