Online Outlook calendar does not show

[vandermark1977]

I am very happy with the script. I added six calendars to it and five of them show fine in my google calendar. It is a mixture of .ics and webcal links.

I have one calendar which does not show: It is a calendar from work. An online Outlook https .ics link. It does show in Google calendar when I add it directly from URL but fails to show when I add it by the script.

Any ideas? I cannot share the link completely, but this is the structure of the link:
https://mail.domain.nl/owa/calendar/[email protected]/LONGCODE/calendar.ics

This is the error I get:

19 dec 2023, 07:59:30 Fout
Address unavailable: URL of my calendar
at callWithBackoff(Helpers:1078:9)
at fetchSourceCalendars(Helpers:136:5)
at startSync(Code:178:21)

The URL link is correct and works when I add it in Google calendar directly through the URL.

I use latest script version 5.8

[vandermark1977]

I think the issue is handled here:
#386

I will try to implement this solution.

EDIT: My installed script allready contains this solution, the error still occurs. Any thoughts?

EDIT 2: These are the first lines of the .ics file, perhaps this helps?

BEGIN:VCALENDAR
METHOD:PUBLISH
PRODID:Microsoft Exchange Server 2010
VERSION:2.0
X-WR-CALNAME:Agenda
BEGIN:VTIMEZONE
TZID:W. Europe Standard Time
BEGIN:STANDARD
DTSTART:16010101T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=10
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:16010101T020000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=3
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VTIMEZONE
TZID:W. Europe Standard Time 1
BEGIN:STANDARD
DTSTART:16010101T000000
TZOFFSETFROM:+0100
TZOFFSETTO:+0100
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:16010101T000000
TZOFFSETFROM:+0100
TZOFFSETTO:+0100
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
DESCRIPTION:\n