iCloud Client isn't working

[thisistheplace]

After setting up the config, (either with de 2-steps authentification or the app-specific-password) there are no birthdays shown.

If i check “http://localhost:8080/MMM-iCloud-Client/birthdays”, the calender.ics looks like this:

BEGIN:VCALENDAR VERSION:2.0 PRODID:-//sebbo.net//ical-generator//EN NAME:birthdays X-WR-CALNAME:birthdays END:VCALENDAR

As i am pretty new in stuff like this, i have no idea how to fix.
Thanks for your help