Here are some pictures of how I solved this frequent problem in my 2021 NV2500. Let's hope it is a permanent fix. Pic1 is of the door mechanism after pulling off the interior panel and plastic. Pic2 is of the adjustment mechanism for the lower rear latch. For my van, this was the one that was stuck. Pic3 is of the 8mm socket I used to loosen and tighten the bolt that holds the bracket in place. The hole for the bolt is slotted, so I simply moved it to tighten the cable. After making the adjustment, I pressed the latch and the door opened normally. I hope this helps others with a similar problem.