Museum Basement Door GLITCHED

MY SON IS SO DISAPPOINTED!
My son and I have been working on all of the artifacts for weeks to acquire the flying car.
I have completed collecting all the museum artifacts but the basement door remains locked.

I have triple checked that I have them all.
I have left the area and came back, tried single and multiplayer, restarted the game, and even tried switching to my pc but in no event does the basement door unlock.

Has anyone figured out a fix for this?
I am playing on xbox game pass