I'm in the same boat, everything but launch greyed out, server details "unknown". It worked fine yesterday. Tried "Save Settings and Restart Game Server", it took forever (which it usually doesn't take any time at all) and didn't fix the problem. Guess we have to submit a ticket that something is borked.
I'm super new to this, in fact this is the first time I've rented a server. I found it super easy by the way, so thanks to the owners for that. My question for Valheim, should I have the server set to restart daily, or should I just let it keep running? Are there pros/cons? What would a smart person who's done this stuff lots recommend?