The servers are coming back online, and the patch notes for Hotfix 1.5.15.1 are available below.

FIXES

• Fixed an issue where XBOX PC players could not connect to the game after the last patch. This also fixes the issue for private servers.

https://duneawakening.com/news/dune-awakening-1-5-15-0-patch-notes/#15151

This hotfix is available for @Steam , @PS5 and @XBOX

If your download does not appear once maintenance is over, please check your queued downloads, or restart your Steam client or console to get the file. Otherwise, you won't be able to connect if you're not using the latest version.