Microsoft Partner Center API - 401 Unauthorized when using access token
I am attempting to retrieve the list of customers from the Microsoft Partner Center API, but I am consistently receiving a 401 Unauthorized error when using the access token obtained from the Microsoft identity platform. Steps to Reproduce: Requesting Access Token I successfully obtained an access token using the following POST request: POST https://login.microsoftonline.com/<tenant_id>/oauth2/token HTTP/1.1 Host: login.microsoftonline.com Content-Type: application/x-www-form-urlencoded; charset=utf-8 grant_type=client_credentials &client_id=<your_client_id> &client_secret=<your_client_secret> &resource= https://api.partner.microsoft.com In response, I receive a valid access token. Calling Partner Center API I am then using the token in the following API request to retrieve customer information: GET https://api.partnercenter.microsoft.com/v1/customers Authorization: Bearer <access_token> Content-Type: application/json Issue The response to the above GET request is as follows: HTTP/1.1 401 Unauthorized Content-Length: 0 Could you please assist in identifying why I am receiving the 401 Unauthorized error and what steps can be taken to resolve this issue?