Getting 401 Unauthorized error when accessing staging endpoint /v1/services

Hello,
I am, Chinh Bui, new to IT Collect API. I have already paired my PIV with login.gov test site. I am trying to access the staging endpoint - https://staging-itc-cpic.itdashboard.gov/v1/services via Postman, and I got an error "{"exception":"AuthenticationException","message":"Agency role(s) for the user do not match the OAuth Clients agency scope(s). User `chinh.bui@treasury.gov` role(s) is `` but the client scope(s) is `treas`"}.

I have put in the following information in the Authorization info in Postman:
1. Access Token: intentionally leave out
2. Callback URL: intentionally leave out
3. Auth URL: intentionally leave out
4. Access Token URL: intentionally leave out
5. Client ID: **cadc271f-32e8-4841-9712-d79e3689846e**
6. Client Secret: intentionally leave out

Could you provide assistance?

Thank you,

Chinh