How to configure a different user other than admin for rest end point of Universal forwarder

[nagar57]

How can I configure a different user and password other than admin to make rest end point calls to my Universal Forwader.
 Current Functionality: 

curl -k -u admin:changeme "https://<host>:<port>/services/receivers/simple?index=abc&source=test&sourcetype=test" -d "splunk rest test"

What I want:

curl -k -u mu_user:mypwd "https://<host>:<port>/services/receivers/simple?index=abc&source=test&sourcetype=test" -d "splunk rest test"

I tried putting this new user in authentication.conf with binddnuser and binddnpassword but it is throwing Unauthorized error.

[richgalloway]

The user must be a local account.  You cannot use a SAML or LDAP account.  It must be the account name and password configured when the UF was installed.