This tend to happen with full 4 man group not puging with randoms and only ran into it with random normals.
That happens is that it looks like the other 3 is offline, if you talk in group chat your comment are not show but assume other can see your messages, you can wisper to others.
As other are shown offline you can not travel to them, however if you travel to any group dungeon they show as online and you can travel to them, this is nice as you can not travel to group dungeons you have not discovered overland or entered by the finder.
Found this by accident as they said BC2 but was in Darkshade 2, but in BC2 I could travel to them, I get the random dungeon reward and did the quest

Two in my group had problems.
Edited by ZOS_Icy on July 3, 2022 12:59PM