Email Bursting not working

I have the below Email bursting definition configured. The Schedule job completes successfully, however I never actually receive an email from it, even though there was data to fetch.

I've tried this first as passing the TO email address as a Parameter from the Data Model, and even hard-coding an email address below does not deliver the email to the intended address.

Is this bursting query formatted with the required columns, and is there anything else I can check?

select 
'H' as "KEY",
'output7' TEMPLATE,
'en-US' LOCALE,
'Text' OUTPUT_FORMAT,
'EMAIL' DEL_CHANNEL,
'test1@test.com' PARAMETER1,
'test2@test.com' PARAMETER2,
'no-reply@test.com' PARAMETER3,
'Test - Populate Bursting Email Address' PARAMETER4,
'Hi this is a test of the Bursting email address definition.' PARAMETER5,
'true' PARAMETER6,
'no-reply@test.com' PARAMETER7
  ,NULL  "PARAMETER8" -- not used
  ,NULL  "PARAMETER9" --not used
  ,NULL  "PARAMETER10" -- not used
from dual