If I join my friends game in a DLC , does that progress me on my own story? I joined my friend and it seems that I’m locked out of my own progress when I play by myself and I have to continue his story.
In your game, you will be able to play the DLC from where you currently are and then when you catch up to a part you have played in someone else’s game then you will have the option to skip anything you have already done. It is an option though, so if you just wanted to play through the DLC without skipping anything then you could choose to do so.
Just set your current quest to main story quest and teleport to where the marker sends you.
You’ll be close to the point you where on (the DLC will have progressed though iirc)