Unable to create event in outlook calendar with external id

[glekhak]

Issue Summary
For Office 365 Calendar service microsoft provides different api's for creating events with & without external Id. Here in cal.com we are using same api for both. If external id is present it is not able to create event in connected calendar.

Code causing issue

async createEvent(event: CalendarEvent): Promise {
try {
const accessToken = await this.auth.getToken();

  const calendarId = event.destinationCalendar?.externalId
    ? `${event.destinationCalendar.externalId}/`
    : "";

  const response = await fetch(`https://graph.microsoft.com/v1.0/me/calendar/${calendarId}events`, {
    method: "POST",
    headers: {
      Authorization: "Bearer " + accessToken,

[milospuac]

Thanks for reporting the issue. Our team will have a look into this.