"Add to Calendar" link returns NULL - ILT Activity Alert

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Hi there,

I am using the alert "Upcoming ILT Activity to Instructors Reminder 1". I have adjusted the text and wanted to get the link to the ics file available for the instructor so s/he can quickly download the outlook ics file. I am trying several options but all of them actually bring NULL. It is a blended offering, ilt activity with webex link, the person is assigned as instructor on activity level. All works well but I cannot get even the Learning Item Id. I guess this is where it all comes from.

The alert is triggered by a job called Process Learning Alerts.