If you see the following message instead of an iFrame registration form, it is because you have disabled the webinar. This will also disable all landing pages and iFrame registration forms so that no one can register anymore.
This registration form is currently not available.
Dieses Formular ist derzeit nicht verfügbar.
Simply reactivate your webinar and everything will be available again.
You can activate it quickly and easily via a switch in the webinar overview.