diff --git a/packages/app-store/office365calendar/lib/CalendarService.ts b/packages/app-store/office365calendar/lib/CalendarService.ts
index 2d1827e06d..3b6629f3ee 100644
--- a/packages/app-store/office365calendar/lib/CalendarService.ts
+++ b/packages/app-store/office365calendar/lib/CalendarService.ts
@@ -42,7 +42,7 @@ export default class Office365CalendarService implements Calendar {
         ? `${event.destinationCalendar.externalId}/`
         : "";
 
-      const response = await fetch(`https://graph.microsoft.com/v1.0/me/calendar/events`, {
+      const response = await fetch(`https://graph.microsoft.com/v1.0/me/calendars/${calendarId}events`, {
         method: "POST",
         headers: {
           Authorization: "Bearer " + accessToken,