Configuring UPN on ADFS and ServiceNow to send the UPN value in NameID Policy in SAML response .
On the ServiceNow IDP record , make the following changes
2)Advanced -> User Field . Set this to the field on the user record where the UPN value is stored .
For example u_upn
On the ADFS Identity Provider end , set the claim rules as per the below screenshot .
Please note this is just a reference example on how to set up on the ADFS end . The configuration changes for ADFS versions and ADFS admins should be contacted to configure this .