However we have an issue with the formatting of the ICS file when sending an event invitation.

My email provider (protonmail) flags it as an invalid invitation and does not integrate it within the calendar.
And when I check the .ics file with the icalendar validator (https://icalendar.org/validator.html) it confirms it is invalid with the following errors:

Errors

    Invalid TZID value or missing VTIMEZONE component (Europe/Paris) near line # 6Reference: 3.2.19. Time Zone Identifier
    Invalid TZID value or missing VTIMEZONE component (Europe/Paris) near line # 6Reference: 3.2.19. Time Zone Identifier

And here is the .ics

BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Calendar App//EN
CALSCALE:GREGORIAN
METHOD:REQUEST
BEGIN:VEVENT
UID:event-7df5733c1c3f462c814b4169851ec93a
DTSTAMP:20260806T091057Z
DTSTART;TZID=Europe/Paris:20260807T090000
DTEND;TZID=Europe/Paris:20260807T093000
SUMMARY:hello
SEQUENCE:0
END:VEVENT
END:VCALENDAR

I've tried to contribute a solution but the codebase for ics formatting was a bit more complex than I expected (and now it seems I cannot access the repo at all?).

Would it be possible to look into it?

Thank you,
Luis