Disconnect when teleporting to party member at azurite mine

I delve with a friend and whenever one of us goes there for the first time and the other teleports the second player gets disconnected and sent to login screen. After reconnecting the disconnect doesn't happen until the first player resets the delve instance and the second player tries to teleport again.

This happens using the whirlpool icon and using the portal created in the first player's hideout when he goes to the azurite mine.

This too has been happening to me during this league Keepers of the Flame, I have done the delve before and not had an issue or maybe its just something that GGG has over looked and or has not fixed this minor error that prevents multiple people going into the delve... Except no matter how many times it kicks me out into the log in screen, it does not let me go into my friends delve only my own.. And if I try to continue into my friends zone I get a nice log in screen awaiting me without my nice warm cuppa