Hi @Anonymous,
Could you please share a screenshot of your flow's configuration?
Could you please show more details about the form that you mentioned? Is it a Microsoft Form?
Where does your Excel file store? Is it existed in your SharePoint?
I assume that your Excel file is existed in your SharePoint, I have created it on my side and the data structure of it as below:
I have made a test on my side and please take a try with the following workaround:
- Add a "When a new response is submitted" trigger.
- Add a "Apply to each" action, input parameter set to output of the trigger.
- Within "Apply to each" action, add a "Get response details" action, specify Form Id and Response Id. Then add a "Delete a row" action of Excel Online (Business) connector, specify Location, Document Library, File and Table. The Key Column field set to Barcode column in your Excel table, Key Value field set to Product Barcode dynamic content of the "Get response details" action.
Note: The Product Barcode dynamic content is the answer to the Product Barcode question in my Microsoft Forms. In addition, please make sure that you have formatted the data of your Excel file stored within your SharePoint library as a table.
Image reference:
The flow works successfully as below:

Best regards,
Kris