ICS event to cancel an earlier ics event

[Bcnewton]

I have a flow that creates an ics file to add an event to a user's email.  That works fine.  

I have another flow that sends another ics event to remove the event if a list item in my SharePoint is changed.

The ics file sends and it offers to remove the event from the Outlook calendar, but when I click Remove from calendar, it does not.

I have written this dozens of ways.  Does anyone have a suggestion on how I can get it to work?  I am also going to need another to update the event in the case that the time was just changed. This only goes on the user's email as it is for a leave request. 

This is my latest way:

BEGIN:VCALENDAR
VERSION:2.0
METHOD:CANCEL
PRODID:-//mysite//EN
BEGIN:VEVENT
UID:@{triggerOutputs()?['body/UID']}
SEQUENCE:2
STATUS:CANCELLED
SUMMARY:Cancelled Event
DTSTART:@{outputs('Get_item')?['body/EventDate']}
DTEND:@{outputs('Get_item')?['body/EndDate']}
DESCRIPTION:This event has been cancelled.
END:VEVENT
END:VCALENDAR