Right side door won't close - 2006 Lincoln Zephyr

Latch sequence in fixture is in closed position. This means the roundish shaped tab is down and blocking the door latch from entering the door.

If you look at the opposite door you will see that the latch resembles a slot for the post on the door sill to slide into when the door is closed. Your problem door will have that slot closed off by the latch.

Sometimes child safety lock-outs may be 1/2 way engaged and it gets the mechanism out of time. Or the spring which operates the latch breaks and the latch will not retract.

Make sure that the latch is doing what you want before you close the door, or you may be writing about what to do if the door won't open.