I have set up the document generator prebuilt function correctly and all the tests passed but when i am trying to pull a report, it is not working. I am getting a bad request. See image below:

I tried googling and setting up the different options but the same error occurs. Has anyone gotten this error?
Resource follow when setting up Document Generator Prebuilt Function: https://www.youtube.com/watch?v=CKM0xgiUvpA