Put in matchmaking for the strike "The Corrupted" got all the way to the boss. Team member and I died while the 3rd ran into the ascendant world that sedia creates, was not able to come back and revive us. So when we chose to re-spawn it put us in a "Turn Back" zone and we keep dying before we can get out of that. The place it spawns us is just after the Ogres you need to kill where you need to fall and dodge the taken revolving orbs. The only way we were able to get back to play was when the remaining team member was alive, died.
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I had the same problem last week, I respawned in the cave with the "turn back" prompt, and was only able to get back in the game when the rest of my team reached the top of the platforms, where the final part of the fight takes place.