4.12.1 Adding Existing Products To Variation Displays No Products

I have 3 existing products that I now want to make into variations of each other, I created a Feature with the purpose "Variations as separate products" and assigned a unique value for this feature to each of the 3 products. I want each of the products to show up separately ini the category view as well as have the variation option on the product detail page.

When I try to add a variation to any of the products and select the Use Existing Products tab, none of the products with this feature are displayed to be chosen.

I can create new products on the first tab, but I've already built out each of the products and want each of them to show the other 2 options available.

Am I doing something wrong or is this a bug?

Thx.

Issue turned out to be a missing column in our SQL Products table. CS-Cart support fixed it for us.

thanks for the answer