Can't join game (PC, EUW)

Hi guys,
So I had stopped playing the MCC after 2020 began because of University, but I tried giving it another shot yesterday and nothing worked.

What happens is, when I look for a game, it takes a while to fill the lobby which I’m blaming on the low player base on Reach, that’s fine.
But then, when the game loads, it stays on “connecting” for a solid minute then kicks me back to the main menu. It’s been like this since then and I’ve been able to join 1 game in 3 hours of trial, it was halo two and kept disconnecting me every 30 seconds until it ended.

Here’s a video of the issue, sorry for the quality - YouTube

Thanks for any help, I’m losing my mind.