Google Apps Script + EventSub

Seems like that. It works when you go to

https://script.google.com/macros/s/AKfycbzjdZ-Rqc5IhZBkGyJsHshmpknvFq-ilEA9cEvN1cLH0I0Snjc/exec

But subscription is pending for a long time and then webhook_callback_verification_failed