Access denied - Observability

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I have full and complete access to my Sandbox - 118765E655DEE7427F000101@AdobeOrg .

Problem 1: have been trying to access https://platform.adobe.io/data/infrastructure/observability/insights/metrics, however been getting following error 

Problem 2: Inspite of passing sandbox  name, it says missing Sandbox name.

{

    "errorCode": "OBS-4005",

    "httpStatus": 401,

    "title": "Access Denied",

    "details": "Access Denied. x-Sandbox-Name is missing."

}