Report in a attestation pass parameter to report

Hello, I built a report and want to attach it to a certain attestations case. I put the report in the attestation procedure. I also setup a specific mail template that states to attach the report. Can anyone tell me what else I need to consider? The report is good and I have tested it and I'm able to get data I just cannot seem to see where else i need to config the attestation to pass the parameter for the report.

I currently get this error... ErrorMessages (2020-07-09 22:06:31.187) [1123010] Missing value for mandatory parameter ObjectKeyBase.

Any help is appreciated.