Dev Store - Product pages are going to a 404

Recently created a dev store as we are duplicating an existing site for a client.

The migration was complete (We used duplify app) and the site aesthetics are matching the exising site.

The problem is now coming when one clicks on a link / selects a product.
It keeps loading a 404 page.

Even in the admin section: products, when I want to share a link: there’s a comment on the store being in development.

How can I allow the navigation back so that one is able to navigate to products, add them to cart etc.