You will need to use the code below to add the Alarm/Reminder in the iCal Attachment: :
Users would need to perform the following steps:
1. Log into the Admin side of the LMS
2. Go to the following location System Admin >> Configuration >> Notification Templates >> then locate one of the template that contain the iCal attachment
3. Scroll to the bottom of the screen and you can paste the above information into the section marked VCAL.
Note: The reminder can be changes by modifying the information for the “Trigger” value
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