I know its been mentioned on "general" but I didn't see anything about it here.

I play on PS4 but its been mentioned on other platforms. Sometimes it works, more or less. Other times, like tonight it will simply give the message "unable to queue" or "someone declined you have been placed at the front of the queue" every few seconds until you get fed up and leave the queue. Seems the same for battlegound and dungeon. It may be linked to how many people are trying to queue. Sometimes it works fairly well. Sometimes like if an event that requires random dungeon runs is gong on *cough* it bugs out often in prime-time.