Logged in last night, door was working for once. Did some quests, got disconnected on my way back to Perion town. Door never worked ever since. Spoiler: Mystic door testing screenshots
I've had the same thing happen on my end. From a party member's perspective, door simply pops up and fades out slowly in town.
Sorry for the semi-necro but I don't think I need a second thread for this So after messing around with door a bit, I found that it does 1 of 4 things: A. You are able to use the skill and summon a door, but you can't enter it. B. You are able to use the skill and summon a door and enter it, but the door disappears immediately after entering. The door will still be seen in the original location but you are not able to use it without casting it again. C. Using the skill does not summon a door at all. (Rarest) D. Door works as intended. Changing channels give you different results, and so far as of update #11 once you're on a channel with a functioning door, it will always work. Haven't tested too much with parties, but so far I haven't had any issues dooring people to locations.