List call events route does not works.

Call Event -- List
GET
https://dialpad.com/api/v2/subscriptions/call

Does not works.
Response:

    "error": {
        "code": 503,
        "errors": [
            {
                "domain": "global",
                "message": "Internal Server Error",
                "reason": "backendError"
            }
        ],
        "message": "Internal Server Error"
    }
}```