iCal not showing meeting time slot for organizer

I have to send a meeting invite for the team and here's my ical

$ical =    'BEGIN:VCALENDAR
PRODID:-//Microsoft Corporation//Outlook 11.0 MIMEDIR//EN
VERSION:2.0
METHOD:REQUEST
BEGIN:VEVENT
ORGANIZER:MAILTO:'.$from_address.'
DTSTART:'.$dtstart.'
DTEND:'.$dtend.'
LOCATION:'.$meeting_location.'
SEQUENCE:0
UID:'.$cal_uid.'
DTSTAMP:'.$todaystamp.'
DESCRIPTION:'.$meeting_description.'
SUMMARY:'.$subject.'
ATTENDEE;RSVP=TRUE:mailto:abcxzy@gmail.com
ORGANIZER;CN=abcxzy@gmail.com:mailto:abcxzy@gmail.com
PRIORITY:5
CLASS:PUBLIC
STATUS:CONFIRMED
TRANSP:TRANSPARENT
END:VEVENT
END:VCALENDAR';

Ended up like

$from_name  = "John";
$from_address   = "abcxzy@gmail.com";

$result = sendIcalEmail($firstname,$lastname,...(something)...$message);

It is working fine for all the recipients.

I have added the user of from mail id to the senders list too which is the organizer mail id (abcxzy@gmail.com) so that he too can receive the invite but when I open the ical file it is not showing the time slot for the organizer but for all the other users it is displayed.

What might be the reason which is causing the issue.

Thanks inadvance

from iCal not showing meeting time slot for organizer