403 Forbidden with Postman for FHIR service in Health Data Services

Hi there,

I'm receiving 403 Forbidden error on postman despite following all the steps in https://learn.microsoft.com/en-us/azure/healthcare-apis/azure-api-for-fhir/tutorial-web-app-fhir-server and getting 403 Forbidden error when trying to call the service using Postman. I can successfully fetch the token for AAD as well as get metadata for my FHIR service but when I try to make any API calls on Patient, I get 403 forbidden. I have also assigned the RBAC role to my fhir service with "FHIR DATA CONTRIBUTOR" to my user but it doesn't work.

error:

{
    "resourceType": "OperationOutcome",
    "id": "80823ab78fdca4ed6ac74d80ebb98f95",
    "meta": {
        "lastUpdated": "2024-04-01T07:06:50.7520201+00:00"
    },
    "issue": [
        {
            "severity": "error",
            "code": "forbidden",
            "diagnostics": "Authorization failed."
        }
    ]
}