Gas cap wont come off

It's been misaligned as it was forced in.
The caps body has 2 protruding alignment slots... I think they are what jammed into the filler neck .

Slide hammer it off. Use the screw end and have to just destroy the cap lock...but that's about all that will remove it.
You will find if you pull on the outside enough...that the outer plate will come off leaving the raw aluminum body portion.
You just want to unseize the jammed portion then the lock should turn and it will come off like normal.