Calendar : Import .ics files : No event found

[Big-bros]

Hi,
I've generated a .ics file with python icalendar module.
The results seems OK (i have validated it on https://icalendar.org/validator.html and I can import it on Outlook, for example)
But when i try to import it on calendar, a message says "No event found" (Aucun élément n'a été trouvé)
I could import some third parties files but not all of them.
Is there some parameter i need to have ? Some forbidden char ? Some encoding (mine is utf-8)
Here is an example of a file i can't import :

BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//JC//NON SGML JCGenICS//FR
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-TIMEZONE:Europe/Paris
BEGIN:VEVENT
SUMMARY:Réunion
DTSTART:20270107T093000Z
DTEND:20270107T113000Z
DTSTAMP:20261022T154950Z
UID:65BF861A25006BA85158A221
DESCRIPTION:ES23 - 
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR

[dfbustosus]

The sample shown should be accepted by the current importer. UTF-8 text such as Réunion is supported, a timestamp ending in Z is parsed as UTC, and the importer does not validate the UID format.

At END:VEVENT, the importer rejects an event only when it lacks a usable SUMMARY or a parseable DTSTART: source. Your pasted event contains both. That suggests the original bytes differ from the normalized text in the post, or an exception occurs while reading or inserting the event.

When generating the file with Python icalendar, write the bytes returned by to_ical() directly:

from pathlib import Path

Path("event.ics").write_bytes(calendar.to_ical())

Do not wrap the result in str(...); that can write a Python bytes representation containing literal escaped \r\n sequences instead of real ICS lines.

Could you attach the original anonymized file rather than copying its text, and include the Fossify Calendar version and source, Android version, selected destination calendar, and any additional toast? The relevant parser code is here, and its date parser accepts this UTC form here.

[Big-bros]

Thank you.
I finally found what the problem was : My file was on an usb key. I could go to the directory from the agenda import feature but i couldn't import the file from there. After having copied the file on my internal storage, it was imported OK.
Not yet very confident with my .ics files, i find the message not so clear. I didn't suspected the file couldn't be read.
Thank you anyway. You're answer made me more confident in another origin for my problem