Instagram Shopping Issue

Hello,

I have been struggling with the Facebook & Instagram shop through the feed. The feed has been uploaded to the catalogue manager, with no issue, has been approved for ads and shops. However, on the Instagram account it appears to struggle to publish the shop as none of the products can be added and when on trying to tag a product in a post, the products are there but they are greyed out and an error message appears.

I appreciate this sounds like a Facebook issue, whom I’m speaking to, however they are not the greatest at resolving problems and I’m wondering if something in the feed could be the issue. The reason for this is the error on Instagram states “This product does not use the domain that you selected for Instagram Shopping”. The feed is for the website https://navylondon.com and the feed (in the link) shows that all products have this same domain so unsure where the issue is Facebook are finding. However one thing I’ve noticed is the first link (link 4) in the feed is http://navylondon.com not https, could this product the error? Has anyone had this problem and solved it?

We’ve waited for some time going back and forth with Facebook so thought reaching out here some resolution may be found.

Thanks

The page I need help with: [log in to see the link]