Facebook page leadgen webhook returns error 102 Server Failure

Question

Facebook page leadgen webhook won\'t work for my page and associated app.

If I test the webhook I setup with the testing tool and click the \"Track status\" button,

Answer 1

I know this is really old but I came across the same issue and this is what I found.

"You can use this tool to create and delete test leads for your forms; however, you cannot use the tool in developer mode."

Basically saying you will get that 102 message if you're in dev mode, which makes no sense why they would have a testing tool you can only use when your app is "live".