I teamed up with a friend to start matchmaking, and we got a notification that the game was about to begin. However, a message appeared saying, "No response from the server" (the same happened to my friend), and we couldn’t start the game.

We tried rejoining several times, but neither my friend nor I could get in, so we gave up and chose to "abandon the match" to start a new matchmaking attempt. After that, I received what seems to be a matchmaking ban penalty for abandoning. My friend, who did the same thing, didn’t receive any such penalty.
I only ended a bugged match that wouldn’t start, so I think this penalty is unfair.

(This image is in Japanese.)

We tried rejoining several times, but neither my friend nor I could get in, so we gave up and chose to "abandon the match" to start a new matchmaking attempt. After that, I received what seems to be a matchmaking ban penalty for abandoning. My friend, who did the same thing, didn’t receive any such penalty.
I only ended a bugged match that wouldn’t start, so I think this penalty is unfair.

(This image is in Japanese.)