A little more on setup for insta shopping pls

Here is a great idea! https://alidropship.com/instagram-shopping-ads/

But I already had a facebook catalogue and all instagram is already connected but the internet (google search cannot help) is not showing anyway to connect a facebook product catalogue to my instagram account. I need to get the catalogue which is already live for facebook working for instagram and I see no way after a good 30 minutes exploration so am reaching out here. I get that it may be easier to start from nothing and that is making it harder because I already have catalogue with no issues. I already have connection to instagram already a business account etc..thanks
Ok I found the tab I needed and see that when I try I cannot meet eligibility though of course I think I do. Hmm will have to revisit this.