IRS-A2A BulkRequestTransmitter message not formmatted properly and/or cannot be interpreted

Question

I am receiving the following error when attempting to submit through the BulkRequestTransmitter Web Service. The Composition Guide is less than helpful as far as this messa

Answer 1

Adding the ds prefix is actually what is breaking this. The SignatureValue element contains the x509 hash of the serialized SignedInfo element (this is where having consistent whitespace matters).

By modifying the SignedInfo element, the authentication will fail when the IRS compares the SignatureValue hash you send against their computation of the SignedInfo hash using the certificate you uploaded and associated with the provided TCC.

Just remove your modification of the SignedInfo element and all should be good. It works for me.