Page Not Found for Listing / No Listings on Listings Page

I cannot get to my listings – when I click “View Listing” in the backend but I am taken to a Page Not Found page.

Is there something simple I am missing or forgetting to set?

If I go to the My Listings page I can see a list of my listing in the frontend but when I click on one I get the Page Not Found error again?

On the “Listings” page even when I add shortcodes I cannot see a my listings?

Can you please advise?

Thanks you for your time