when saving the ical file locally, and importing, this works without issue, however when trying to subscribe i get the error "undefined"

the URL for the claendar  in question is  https://cid-1c2fcfde0a98464f.calendar.live.com/calendar/private/28ea37c6-197e-4be7-aa1a-ec877a56b5f2/2b2357ac-5d85-40ea-8ffa-368f9d352b93/calendar.ics