The following error occurs as I try to access purchases/subscription endpoints of Google Play:

{
    "error": {
        "code": 401,
        "message": "The current user has insufficient permissions to perform the requested operation.",
        "errors": [
            {
                "message": "The current user has insufficient permissions to perform the requested operation.",
                "domain": "androidpublisher",
                "reason": "permissionDenied"
            }
        ]
    }
}

The following configurations are already done :

• Service account with permissions are created
• Service account email address added in license tester section in playstore
• Enabled google play apis in Google Play Console