You can use the Realtime Webtask Logs extension to debug. Then console.log()
Beside of course checking the logs on your end / API as well. I guess it’s a public API and reachable by Auth0, no IP whitelisting required, etc.
If there are still issues, you can post the hook code in here (remove anything sensitive), maybe there’s a logical issue to spot.
The hook works fine in “simulation mode” where I click the run button but it is not firing or working fine when I am adding a user from the “create user” button of the dashboard.
This shouldn’t make a difference, I just tested it. (Created a user via dashboard, hook gets called)