Postman REST API / SSO niewbie question

Hello - I'm new to using Postman and REST API: I'm trying to test REST APIs from Postman in my 16.2.1 environment, where I have SSO enabled using OTDS. I keep getting error 401 ("Invalid username/password specified."); When I setup request HEAD and test it (http://.../OTCS162/cs.exe) with my username and password it works (status 200 OK). Can you please help (screenshot would be quickest) on how you have Postman setup to test a simple API GET working when SSO/OTDS is involved (for ex. "api/v1/serverinfo")

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