Hi,
Hope you are doing well.
Attached is the screenshot of the Rule-set for changing the format of the Authentication scheme from NTLM to WinNT.
The value of the authenticated-user header format is saved into a user-defined property, change the authentication method to WinNT, call the reqmod and then restore the Authentication method after.
After this, it will be WinNT://server/username
Request you to do the configuration as per screenshot and check.
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Regards
Alok Sarda