A recently deceased couple must find a way to reconcile their marriage in the afterlife before crossing over.

Good concept. I love the title. I'm sure you know more than saying (hiding the ball), but the logline could use some detail. The genre (from Blake Snyder's Save The Cat) is Out Of The Bottle. Make sure you read his overview. The three ingredients:a wish, a spell, and a lesson will help you frame your story. I also think one of "the couple" shoul be the MC - as in a "cuckolded Husband" or a "philandering husband/wife". Good luck, great idea.

I agree with FFF. Though the idea is original, the logline should include some more details to make the reader want to sink their teeth into it. I would say just build upon this logline with some more action and description. For instance, how did the couple die? Is there something quirky or odd about the husband and wife?

Hello, the idea is interesting, I think you should include some details aboute what we will see in the movie ans stress more the main elements of the plot. Something like:
"When a recently deceased couple found herself stuck in an afterlife replica of their appartment, they learn that they must reconcile their marriage before crossing over".