Can't start Maliwan Takedown

Hello all,
I’ve finished the game in all campaign mode, and I have the quest “Takedown at Maliwan Blocksite”.
But I can’t even open the doors to access the site. It’s a bug or did I miss something else ?
Here is a screenshot.

Thanks

Maybe go back to Sanctuary and then fast-travel to the Midnight Cairn again?
From your quest objective it looks like the game didn’t recognize you travelling there.
Did you maybe go there whilst you were in a multiplayer game?

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This is the most plausible explanation