I'm keeping getting this EAC error when trying to use multiplayer on Halo MCC on steam...

Hello amazatron72,

Thank you for sharing your concern here in Xbox Community Forum and we hope that all is well.

Based on the description, you are having issue with Halo Master Chief Collection played on Steam Deck. Let us see how we can help.

Our focus here is on helping with a wide variety of Xbox product and service-related issues. Most game-specific issues, like what you are describing here, need to be addressed by the developer or publisher through their sites. Let us help you get to the right place.

For this, the best approach is to contact directly the game developer support team. You may also check the official article provided by the game developer that tackle on the game update release currently. The link to contact Halo Support can also be found on the official article.

• Halo: The Master Chief Collection (MCC) Steam Update – April 2023 – Halo Support (halowaypoint.com)
  

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When I'm connected to the internet, I still get error code 0x800701b1. It's only when my internet is off, I get stuck at EAC. I'll try disabling my internet and opening without EAC though.

Yet here is MCC with Halo Reach and it downloads with the EAC disabled mode and we still can't mod the game. Super loving it.

has this issue been resolved yet? I have also tried all these steps and i'm getting this error too. MCC multiplayer works just fine but halo infinite still shows me this error.

I'm on my Xbox 1 just logged onto it and fired up Halo MCC haven't been on it since early last month, no XBL Updates since then, and when I launched it, 3 Achievement notifications popped up! I guess they fixed Achievements for Halo MCC. I'm in a Team Slayer
multiplayer lobby and matchmaking is working!! I'm actually IN a multiplayer game in Halo MCC. Last time I was here, matchmaking was broken.