I am doing the Exodus Crash strike for the Relics of the Golden Age quest and when you get to the point where you need to kill the fallen walker it doesn't spawn and when you go into the ship again a shield is up and you can not continue.
Edit. restarted the mission same thing happened so I just sat there for about 15 minutes and the objective finally updated.
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Specifically, someone joining after you pick up the third set of arc beams but before you travel to where the walker is. There is a checkpoint between the areas that triggers some dialogue that has to happen. If you should be seeing the tank, check your waypoint to see if it's seemingly telling you to backtrack.
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This normally happens when someone else joins the Strike. The objective does not get updated and therefore the Fallen Walker does not spawn and with it the Wall does not disappear. In that case, you should wait until the new Person spawned in or if it is a Darkness zone, you can simply wipe.