In case you didn’t know, today is the first day of XDefiant’s server test session, and while a lot of players seem to be able to play it normally, some are running into Delta-01 and Mike-01 errors regardless of platform.

I can personally attest that it has happened to me even after connecting to the game’s servers, and the XDefiant Delta-01 error showed up after it matched me with other players.

XDefiant Players Seeing Delta-01 and Mark-01 Errors on First Day of Test

The game’s subreddit is littered with people experiencing the issue, and one possible cause is that people are downloading the wrong version of the client. If you’re trying to play using the old XDefiant beta client or just redownloading what’s in your library, that won’t work, but there is a possible fix.

I actually downloaded the wrong version but if you find the game on the store, click the 3 dots and then download Test Server Session pic.twitter.com/okwDefYTh1

— KingScrufflez (@KingScrufflez) April 19, 2024

That has fixed the issue for some, though it’s not a guarantee. Again, I have the proper server test client and still saw the Delta-01 issue surface. Odds are, the servers are getting hammered with multiple login attempts all around the world. Just retry logging in and matching up and it should work (hopefully).

If you want to be certain you’re downloading the right game client for the weekend test, you can get it from our links here.

There’s been quite a lot of changes made from the last beta to this one, and if you’re curious what they are, read on for the latest patch notes.

Stay tuned, as we’ll have more XDefiant coverage all throughout the weekend given we have limited time to play the game.