file .ics to delete appointment not recognized by outlook - icalendar

Question

I send a icalendar when a user create an appointment on my application and the file ics is regularly recognized by outlook.
If the user delete the appointment on my application i send a icalendar with canceled notation, but the .ics file is not recognized (not supported calendar message.ics)
Icalendar which create the appointment on outlook (regular recognized):
BEGIN:VCALENDAR
PRODID:-//Schedule a Meeting
VERSION:2.0
METHOD:CANCEL
BEGIN:VEVENT
DTSTART:20190718T033000Z
DTSTAMP:20190718T113347Z
DTEND:20190718T040000Z
LOCATION:
UID:Tesis10910
DESCRIPTION:
X-ALT-DESC;FMTTYPE=text/html:
SUMMARY:
STATUS:CANCELLED
ORGANIZER:MAILTO:fc#newteamsoftware.com
ATTENDEE;CN="fc#newteamsoftware.com";ROLE=REQ-PARTICIPANT;RSVP=TRUE:mailto:fc#newteamsoftware.com
BEGIN:VALARM
TRIGGER:-PT15M
ACTION:DISPLAY
DESCRIPTION:Reminder
END:VALARM
END:VEVENT
END:VCALENDAR
Icalendar which delete the appointment:
BEGIN:VCALENDAR
PRODID:-//Schedule a Meeting
VERSION:2.0
METHOD:CANCEL
BEGIN:VEVENT
DTSTART:20190718T033000Z
DTSTAMP:20190718T113347Z
DTEND:20190718T040000Z
LOCATION:
UID:Tesis10911
DESCRIPTION:
X-ALT-DESC;FMTTYPE=text/html:
SUMMARY:
STATUS:CANCELLED
ORGANIZER:MAILTO:fc#newteamsoftware.com
ATTENDEE;CN="fc#newteamsoftware.com";ROLE=REQ-PARTICIPANT;RSVP=TRUE:mailto:fc#newteamsoftware.com
BEGIN:VALARM
TRIGGER:-PT15M
ACTION:DISPLAY
DESCRIPTION:Reminder
END:VALARM
END:VEVENT
END:VCALENDAR

Answer 1

Few things:
don't know if it is intended but your first iMIP message already has a METHOD:CANCEL instead of REQUEST.
your second iMIP message has a different UID. If this is really what you are sending, it is normal for the client not to recognise it as the cancel of the first message.
Your second message lacks a SEQUENCE property with an increased value. See https://www.rfc-editor.org/rfc/rfc5546#section-3.2.5
there is no point in adding the VALARM component. Clients will always ignore it.