Adobe Recommendations | Item Based Algorithm is not returning any data

[LordOfTheRings]

Hi Team,

We have used Item Based >  Items with Similar attributes > Current Item criteria.

When I hit the delivery api for the server side recommendation activity I do not get any content in response.

The collection that the activity is using has the products and the activity is not using any exclusion.

Can anyone advise why the activity is not returning any recommendation products?

Thank you.