...
Now, click the "Attributes" tab
We are going to add 3 4 SAML attributes
The first attribute is "UPN"
...
For this attribute, select "URL Path" as the location and enable the "Get Input" option
The last attribute to add is "authnmethodsreferences"
Claim Type: http://schemas.microsoft.com/claims
Fixed Value: http://schemas.microsoft.com/claims/multipleauthn
Click Save
Change NameIDFormat
...
change NameIDFormat to "Map to the following attribute", and Attribute to "ImmutableID".
Finally, click "Save"