As a Reporting Agent, you will typically sign all of your returns with the following data items below:

EFIN – Electronic Filer Identification Number (IRS Supplied after submitting an Online 8633 to the IRS and passing suitabiliy.)
Reporting Agent PIN – (IRS Supplied as a result of filing your 8655’s with the IRS Ogden Service Center.)

As a Reporting Agent, you will not use the 94x Online Filing PIN field and should leave it blank.