When we trigger a POST to webhooks.json, the endpoint returns a 200 code but no webhook is created.

[aaronkleinsol]

When we trigger a POST to webhooks.json, the endpoint returns a 200 code but no webhook is created. This same call works on our different Shopify sites.

Anything that would cause this?  I can manually create the webhook in the UI, but through the API, it doesn't create on one site.