Titanfall 2 Mission Blood and Rust Doors won't open

Hi- Playing through the "Blood and Rust" campaign mission in single player. I have reached the point where I pass Captain Roberts and the other soldiers and proceed down the hall. I was able to find and open the doors to help the remaining Militia the first time though. However, when I respawned and when back to try it again, the doors to the area where the militia were would not open.I've tried three or four times and every time the doors are closed tight. Not sure what's wrong or if it's 

Playing on PC; Ryzen 2700x/32 gigs of RAM. GTX 1660 TI video. No problems technically so far.