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Correct answer by
Community Advisor

If you are trying to exclude certain ids from showing up, then Recommendations has a param that is built for that:

 

function targetPageParams() {
   return {
      "excludedIds": ["352", "223", "23432", "432", "553"]
      }
}

 

https://experienceleague.adobe.com/docs/target/using/recommendations/plan-implement.html?lang=en 

 

For your particular question, I don't think you need to stringify the param value since Adobe will be expecting a list (array) on both the left (param) and right (item catalog column) side. 

 

I have found that Adobe Target Recommendations is much easier to troubleshoot by generating a debug token from the Administration / Implementation interface. 

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