The servers are coming back online, and the patch notes for Hotfix 1.5.3.6 are available below.

https://duneawakening.com/news/dune-awakening-console-release-patch-notes/#1536

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

Remember to restart your Steam client if the download does not appear.
If you're playing on single-player, make sure to restart the game to receive the update.

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