Each time when i try join team instance no matter level,no mater browser which one or client i get same error you are offline please log into the game again,players from group on any server said is something normal ,usually that happens few times before you can join team instances,a oasisguide told me to print screen and post to have a proff of what i said,didnt find on forum something related to this i maybe been looking the wrong place or really no one posted .
hope this help
best regards