ical (ics file) not working on Mac calendar

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I have a .ics file that works with outlook gmail and any calendar I tried. Mac calendar does not display errors but as a matter of fact it doesn't save the event. Obviously the file header type is text/calendar. Need help to get what is missing here.

BEGIN:VCALENDAR

VERSION:2.0

PRODID:-//Technology//NONSGML Calendar//EN

CALSCALE:GREGORIAN

METHOD:PUBLISH

BEGIN:VEVENT

UID:20190218T094757-1209729636

CLASS:PUBLIC

X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY

ORGANIZER;CN=robert:MAILTO:abc@[login to view URL]

DTSTAMP:20190218T094757Z

DTSTART;TZID=America/Panama:20190227T070000

DTEND;TZID=America/Panama:20190227T093000

LOCATION:berlin

SUMMARY:test

TRANSP:TRANSPARENT

END:VEVENT

END:VCALENDAR

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