Has anyone else experienced the issue just recently that you can launch the game from a signed in GOG Galaxy account but when you've selected to join multiplayer inside the game it's still stating you require a connected GOG Galaxy to access the online multiplay server list?

I'm hoping it's just some intermittent back end thing with them stress testing Galaxy atm.

Yes I'm experiencing this too. Thankfully LAN seems to work for me so it isn't a major issue for now but would like acknowledgement from GOG or Crate that it's being worked on.

Same here, worked a few Days back when I bought it, but since 3~4 Days it always says you have to log in etc =/

Same here!

I just tested it at this instance and it allowed me into the server list... it also didn't show any games, but the list could simply be empty atm.
I will try to get some more testing on at different times for SCIENCE!!!

Tested again an hour later after ctrl+alt+deleting out of a freeze state on personal portal traverse. Loaded it back up from the still signed in Galaxy client and it's now giving me the same error (not logged in).
So the problem still exists.