Astroneer does not work with the latest Proton 11 release as of 6/27/26. Search in the top right of AMP for Proton GE Release Version and set it to GE-Proton10-34. Then update the Astroneer server inside the instance again.
This should get it working for now until they solve the issue. Once they do, the setting can be reverted back to blank to stay on the latest release.
Thanks. I changed the Proton GE Release Version to GE-Proton10-34 as advised and updated the Astroneer instance.
The Proton environment has been rebuilt and AMP now reports:
However the issue is unchanged.
The server process starts successfully, UDP port is listening, and the game can add the server to favourites, but it always shows Offline.
The ShareCode remains blank even after leaving the server running for several minutes.
Is there another known issue that prevents PlayFab registration, or is there a diagnostic log or command I can provide that would show why the ShareCode is never being generated?
That sounds unrelated if the game shows running. I’d open a support ticket.