Authorization of One Roster api's

I have failed completely getting these calls to be authorized. Any direction will be most helpful. Thank you!

(Possibly the environment that I am choosing, I wonder)

Here is one example of the error I receive:

Response status

401 Unauthorized

Response latency

50 ms

Response content

Date: Fri, 05 Aug 2022 14:02:36 GMT
Content-Length: 219
Content-Type: application/problem+json

{
"statusCode": 401,
"message": "The required Authorization header was missing or invalid, or the token has expired",
"status": 401,
"title": "The required Authorization header was missing or invalid, or the token has expired"
}