Same as title. Options to accept or reject are grayed out. Other player is L1 and it says waiting on them to accept or decline.

It should force-join or boot him once the boot time is over (iirc, its been a long time since I played QM)

It looks like it just went through a few seconds ago, thanks for the insight and quick response! I don't remember seeing this happen before.

Is this because of auto-invite?

Just as a follow-up: The game started, and they got booted after 2 minutes of inactivity Turn 0.

I think this happens when you successfully steal your opponent's colour.