This problem was quite simple to solve, but i wanted to post in case someone else got it and didn't find any quick solution from google (as i did not). So in teamviwer host for servers you get two kinds of id, one to join a current logged on user and one to remotecontrol the server with the ability to log in. I've seen a few times a bug where those id's are the same, which then means you cannot log into the server without someone already beeing logged inn (even though the ID that apears used to be the server ID. A simple reinstall without deleting settings will solve the problems, and you get to keep any passwords etc and ID.
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