OpenAPI having trouble registering for Event Notifications

I have followed the OpenAPI documentation here OpenAPI Developer Document
And registered a webhook URL as described:


{
    "header": {
        "namespace": "Uhome.Configure",
        "name": "Set",
        "messageId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
        "payloadVersion": "1"
    },
    "payload": {
        "configure": {
            "notification": {
                "access_token": "<access_token>",
                "url": "<notification_url>"
            }
        }
    }
}

I receive:

{
    "header": {
        "namespace": "Uhome.Configure",
        "name": "Set",
        "messageId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
        "payloadVersion": "1"
    },
    "payload": []
}

This seems to have been accepted, but I receive no Uhome.Notifications at my webhook address. There is some mention of “subscribing to Events” but I can’t get this to work. I have looked at various integrations (HA utec_py for example), and they are all doing exactly what I am doing, but I have no success.

The webhook works (if I manually test it), but the logs don’t show any activity from OpenAPI at all.

I don’t know how to confirm that the webhook registered, or to list active webhooks.

Has anyone got the Notification callback to work? and if so how?
Thanks.

@Waterton We apologize for any trouble caused by this matter. Our agent will reply to your support ticket#560610 soon. Please check it later.