Co-op delve not functional in league

Why does attempting to join a friends mine encampment automatically kick you to the log in screen? It's been a persistent issue for me and my gf for about a week now. Any word from GGG On a fix? We tried again tonight because there was a small patch the other day and assumed GGG would fix such a large error but I guess not. Any work arounds, or any one else having the same issue?