I keep seeing "invalid cross reference id" as the reason for multiple external call failures for the past couple months, specifically for external calls that are meant to update leads/contacts, or associate leads/contacts with campaigns. I have been back and forth through all the field mapping for all the calls, and just can't figure it out!
I can see that lead/contact activities are populating in SFDC, and that Eloqua campaigns are populating in SFDC, but lead/contact campaign association is definitely not happening (on either the SFDC lead/contact view or the SFDC campaign view).
If anyone has any ideas for me so solve this external call failure, it would be much appreciated!