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Map Federated ID to Username

With SFDC as an IdP, is it possible to map SFDC Federated ID to a Username in the SP?  

The SP system does not support a Federated ID field. 


I tried to set this up with 2 salesforce instances (hub & spoke) but it did not work. IdP instance was setup to send the SFDC username of the user in the SP instance in the Federated ID field.

Best Answer chosen by Admin (Salesforce Developers) 

Nevermind - this worked - looks like the login URL is just when you do not use a Federated ID. When you do use a federated ID, it appears the ACS URL changes each time you save the settings - that one messed me up a few times.