I've got an answer for that--as well as a few extra bits of info about how Conjured Doorways behave in the world. 🙂
If the door owner's party is full, there won't be a request option and the door will look closed.
Additionally, interacting with any other player's door gives you the option to hide it for yourself. Your door is automatically hidden from players you have blocked.
We'll be sharing many more details this Friday on the livestream--don't miss it!