Flow Designer regarding Service Catalog - Get Catalog Variables Action

[GwynethPhoS]

I'm working on two catalog items for Supplier Onboarding and Submit Supplier Document. Inside my flow for each catalog, I have the Get Catalog Variables Action but its shows error: attached here it shows that the mandatory fields are empty or invalid even when I tested it and submit the catalog, I have input for the Supplier and Supplier Name field. What steps should I take for the variables to reflect on the custom table and my flow to execute completely? Thank you for help.