https://answers.microsoft.com/en-us/outlook_com/forum/all/o365-outlook-calendar-cant-sync-with-ios-calendar/518d8cb4-60ba-4945-be9b-f1e736d4e4b1
I have the same problem as stated in the link above, but no solution has been found.
Here's what's happening:
We use Microsoft 365 at work. I have set up a shared calendar and everything works great in the iOS Outlook app. I am trying to get the shared calendar to work in the native iOS calendar app since that's where all my other calendars are. In the native iOS calendar app, the shared calendar does show up. Events created on desktop Outlook or Outlook online will sync and show up on the iOS calendar app. The problem is creating an event on the iOS calendar app. The event will show up on the iOS device, but it will never show up on other devices.
Some weird things I've noticed:
- If the event created on the iOS device is an all-day event, the event WILL sync.
- If I change the time zone of the event on the iOS device to London, the event WILL sync.
- If I change the time zone of the iOS device to London, the event WILL sync.
FYI, my devices are all set to Eastern Time (New York). Something about the time zone is throwing off the sync process.
I know I am not alone in this issue since I've linked a post above with users having the same issue. I've also found forum posts on Apple of the same issue (see link below).
https://discussions.apple.com/thread/252984635