Thx dude, this worked.Find the starmade folder.
typically under /users/(name)/steamlibrary/steamapps/common/starmade/starmade/
in that folder find the file "blacklist" I think it is. If someone is banned they are added to the blacklist.
EDIT: posted too soon, next step. Remove name from blacklist, save the file and try again.
Since singleplayer is just a private server it functions the same../forum_ban Rixxan 24hours
I've had this happen to me before, it was annoying and my friend laughed at me. That file's only used if you're hosting a server right?