Client Credentials vs Authorization Code for Server Reporting

Is it possible to use the Client Credentials grant type for a server-side reporting app that needs to access historical interaction data, or must I use Authorization Code? The docs state “The client credentials grant is intended for backend services that operate without user context,” yet my test script fails with a 403 Forbidden when requesting interaction summaries using the token generated via POST /oauth/token with grant_type=client_credentials.

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