Had this happen a few times last few days, always seems to be late night/early morning.
Make a group for an abyssal dungeon in Find Party. Click on enter, it pops up, all 4 people click accept. The game then creates the cross server group with all those 4 people, then just doesnt teleport us into the dungeon. Nothing happens. It makes the group then just stops. Cant Create Lobby as it says group has people on another server, and trying to manually enter in on the dungeon page just says “An Error has occurred”.
Only had this happen since last weeks matchmaking server fixes, so something with the fix might be scuffed somewhere.