Hello @Edeejay ,
Thanks for reaching out.
name claim( http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name ) mapped with
user.userprincipalname source attribute as additional claims for enterprise application. This is default claims which can be verified from User attributes & claims setting as shown below and this can be modified as required by adding new claim and deleting default one.
Hope this helps.
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