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Thanks SO MUCH for all your support, and we'll see you in-game!
This happened to me too. I was able to make my way all the way to the staging area. It seems there's a horizontal wall to keep us from going too high in certain areas. I think I was running on top of it. I could climb on terrain when it went high enough to meet my level.
I went back and couldn't reproduce it. Note this happened before I accepted the mission.