Configure IdP token processor mapping
Steps
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Click Map New Token Processor Instance and select a configured Username Token Processor as the Token Processor Instance.
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On the Attribute Retrieval screen, select the option to retrieve additional attributes from data stores to fulfill the attribute contract.
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In the Attribute Sources & User Lookup screen, configure the LDAP data store that will return the upn attribute for the corresponding user, adding userPrincipalName as an additional attribute and including a filter value such as
sAMAccountName=${username}
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On the Attribute Contract Fulfillment screen, select Text as the Source for SAML_SUBJECT and enter an unused value. Select LDAP as the Source for upn and select userPrincipalName as the value.
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Configure issuance criteria, if necessary.