Affiliate product link error

Hi there,

When I use a product link from my affiliate program I get the following error message; There is an error in your link code.

If I use this same link directly in my browser it works perfectly. I tried this same link in another catalog plugin and it works fine too.

If I create a License Plate Link (shortened URL) from the same affiliate link generator it works perfectly.

Problem with this is that I don’t get a shortened URL from my datafeed.

Am I missing something? Can you please advise?

https://wordpress.org/plugins/ultimate-product-catalogue/