How reproduced

• go to the demo https://demo.ametys.org/nightly-intranet/projet/evolution-des-modes-de-transport-urbain/fr/calendars.html
• create a calendar
• create events associated with this calendar
• Copy ics feed url (https://demo.ametys.org/nightly-intranet/projet/evolution-des-modes-de-transport-urbain/_plugins/workspaces/fr/undefined/agenda.ics)
• Import it into outlook

The calendar does not import into outlook

But, if we refresh the page, the url of the calendar is correct (without undefined)