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

Ok I found the problem.

Although my app was correctly subscribed to the page with all valid and never expiring tokens, one authorization was missing.

If you encounter the same problem follow those steps :

-> go to business manager
-> go to busienss settings
-> go to leads access tab
-> select your page
-> click "CRMs"
-> Select your app and assign access

Hurray