If you're not seeing incoming webhooks on your side, the first step is to rule out where the issue is happening, whether it's on our end or yours.
We recommend adding a neutral, public listener like https://webhook.cool alongside your current webhook URL. This lets you check if we're sending the webhooks at all. If it works with that listener, it's likely an issue with your receiving setup.
If you're still not sure after testing, feel free to reach out to us with details and we can help check on our side.