Hi Marco,
What table do you have configured on your record producer? I'm assuming the table specified is something other than sc_task. Is your flow then being triggered from record creation on that table from which you are looking to create a catalog task record? If the end goal of the record producer is to create a catalog task, I'd recommend using a catalog item instead of a record producer. With a catalog item, the flow trigger would use Service Catalog and then you can use the "Get Catalog Variables" action and then select the specific catalog item to get the list of catalog item variables.
