@prograds @julian.mcneill You are probably encountering the same issue where there is a timeout assembling the JSON. We do return an error message on the action if we encounter an error so you might look at creating a log in your database that stores the all the results of the Create CSV from JSON (SSA) including error, base64, etc.
Also, keep in mind that if it works on 250 in dev or a subset in live but not the full list of records, you may have data that is breaking your JSON. This would be exposed in the error message that is returned. In this case you’ll need to be sure you are using format as JSON-safe on any values that could possibly contain a breaking character such as a double quote or new line.
Otherwise, you will likely need to take the steps outlined in the following video to create your JSON first and then run the Create CSV workflow:
