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With Cart-Based recommendations the recommendation keys are supplied through the mbox parameter cartIds in comma-separated values. You would not be using the entityId as the key like you would in a typical Recommendation activity. Ensure you are passing the cartIds as specified here. 

More info on Cart-Based Recommendations is located here

Also note that the available algorithms for Cart-Based are as follows:

  • People Who Viewed These, Viewed Those
  • People Who Viewed These, Bought Those
  • People Who Bought These, Bought Those

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