I have followed the instructions
Note: To access a web service's WSDL, an HTTP Basic authorization header must be provided for a Username/Password combination that has the Determinations API user role.
provided on
https://documentation.custhelp.com/euf/assets/devdocs/cloud20c/IntelligentAdvisor/en/Content/Guides/Developer_Guide/DeterminationsAPI/Authenticate_w_secured_Web_Service.htm
The implementation seems straightforward but I keep running into 401 responses. I am not able to authenticate this via Postman:

The headers have been added in base64 as per the documentation:
Is there anything specific that needs to be added on top of this?
Also, I noticed in the most recent version, I am not able to enable Anonymous access to APIs?