The unskippable white video that appears right after the lobby menu (that locked up the game in my last report--and it will likely reappear to announce future seasons, as the title screen video obviously still has this problem, too) no longer appears, allowing me access to everything in it except Ranked Match (which is obviously level-locked). Everything offline works flawlessly until entering a Casual Match--when a match is found, right after the loading screen which follows team introductions, the game boots me back to the title screen with the dialog "You were kicked because cheating was detected." followed by a second dialog that claimed that it couldn't find the network and couldn't connect--causing a forced exit. (When I entered the lobby again I noted that I was given the standard penalty for leaving a match, so I figure I shouldn't be doing this too often.)

...So I've come this far to learn--as with the rest of you--that the EAC situation hasn't yet been resolved. This is obviously something that needs to be discussed with Bandai Namco--sooner rather than later, because the Steam version of the Gundam Battle Operation test was supposed to have similar EAC configuration issues (and that is on track to eventually have a full Steam release, too).

tl;dr 1.)There is still a codec issue that prevents video data (not accompanying audio) from playing, potentially halting use of the game (Proton issue?); 2.) Unlike other Bandai Namco titles (like Jojo All-Star Battle R), EAC has not been properly configured for Linux support, and will kick you off of the game if you try to join a match (evangelical issue with Bandai Namco--someone, most likely at Valve, has to contact them about this).