Both of us on SoR could not enter, we got pop up window but nothing, 3 from CD got in fine, we had to guest to CD in order to get in, others on SoR having the same issue.
EDIT: the game DC’d the other party member from SoR and it would not let them rejoin the instance, it then kicked me from the game, and wouldn’t let me rejoin the instance, we are both in the UK connecting to SoR NA server, this needs to be looked into.