Cannot Join Any Multiplayer Match [Steam, Windows 11]

Ryzen 9950x, RTX 5070ti, 64gb RAM, Windows 11.

Description of Problem:

Start game. Select multiplayer mode (whether it be Conquest, Escalation, etc, etc). Click "Start" button at bottom left of screen. It starts counting down, saying it's matchmaking. The countdown stops, I hear the sound, and my soldier stands up, it remains that way for a few moments (15-20s) and then the "Start" button returns to the bottom left again. Pressing it again does the same thing as before, but it never connects and no error messages are ever shown.

Attempting to connect via the server browser never connects either, but I at least received an error message when attempting to use that method, but only a couple times. That error message is the "Match Not Joinable" error which I have enclosed an image of. Whether presented with an error message or not, it never connects to a match that way either.

I have been able to connect to 3 matches total in my time owning the game, and I suspect each time was a fluke, because it hasn't connected twice under the same circumstances. All successful connections were via the matchmaking from pressing the "Start" button in the lobby. The first time was after uninstalling and reinstalling the multiplayer component of the game, but that hasn't worked since. The second time was after launching the game from the "EAAntiCheat.GameServiceLauncher.exe" in the Battlefield 6 install folder, which also has not worked since. The third time was right clicking the "bf6.exe" file in the game's install folder and running as administrator, but that has not worked again either.

I have reset router and modem multiple times. I have restarted entire PC multiple times. I have completely uninstalled and reinstalled the entire game multiple times. I have tried repairing the EA Anticheat. I have completely uninstalled/reinstalled the EA Anticheat. I have verified the game files with Steam multiple times. I have used a wired and wireless connection (all successful connections were with wireless). I've ensured no removable USB drives are attached. I've disconnected my Wacom tablet and turned its software off. I've turned off other services/software (such as Riot's Vanguard anticheat, Discord, etc). I'm probably forgetting to mention other things I've tried.

I've noticed that the only thing my 3 successful connections had in common is that when starting the game, during the "Connecting to multiplayer services" stage before "Loading Shaders" there has been a queue prompt that appears saying I'm 1500/1500, or whatever the # happens to be. If I see the queue prompt when starting the game, I get excited. I haven't seen it since, though.

I've completed the campaign, and it has run perfectly in every regard EXCEPT being able to connect to multiplayer matches.

I'm beginning to run out of patience, and have a feeling I can't get a refund now that I've completed the campaign (which was completely irrelevant in my decision to purchase. I literally only want multiplayer), but I may still try, because this is becoming unacceptable.