Calling a webhook URL can return various status codes for different problems. Below is a list of the most common codes and reasons.

Code	Description
404	The webhook URL you tried is not valid. Visit the Cloud panel to verify the URL you are using.
405	The method (GET/POST/etc.) used for the webhook is not allowed. Check the trigger configuration of your automation to make sure you are calling it correctly.
503	Your Home Assistant instance is not connected properly to our services. Check your system health section.