On at least three cooperative missions in Kuva Fortress, I was unable to pass through the main door into the fortress. It appears closed and displays the 🚫 No Entry symbol on it for me, but other party members are able to pass through normally. I was unable to interact with any consoles that might open it.
This might be due to the slower load time on my laptop where I only load into the mission after the door has been opened by the rest of the squad.
On one occasion, dying and reviving myself allowed me to pass through the door, but I was unable to repeat that workaround upon trying it a second time.
(I lost the screenshot, but will add one if it happens again.)