iPhone or Android Not Syncing with Outlook Calendar

iPhone or Android Not Syncing with Outlook Calendar

If calendar events created on your computer are not appearing on your phone, or events added on your phone are not syncing back, the issue is usually related to the Outlook mobile app, account sync settings, or a stale connection to Microsoft 365.

Troubleshooting Steps

  1. Make sure you are using the Outlook app. Your work calendar syncs reliably through the Microsoft Outlook app (not the built-in iPhone Calendar or Google Calendar app). If you are using a different app, switch to Outlook for your work account.
  2. Check which calendars are visible. In the Outlook app, tap the calendar icon at the bottom, then tap your profile icon or the account name. Make sure the correct calendars are ticked. Shared calendars must be enabled separately.
  3. Force a sync. Pull down on the calendar or inbox view to trigger a manual sync. If the app has not synced recently, this can resolve the issue immediately.
  4. Remove and re-add the account. If events are still not syncing:
    • Open Outlook, go to Settings (gear icon) > tap your work account > Delete Account.
    • Re-add the account using your work email address. You will be prompted to sign in and complete MFA.
    This forces a fresh connection to Microsoft 365 and resolves most persistent sync problems.
  5. Check for app updates. Go to the App Store (iPhone) or Google Play Store (Android) and make sure Outlook is updated to the latest version.
  6. Restart your phone. A restart clears background processes that may be blocking sync.

If the Problem Persists

Submit a ticket with the following information: phone make and model, whether the issue affects calendar only or email as well, and when it started.

Still not syncing? Submit a ticket and a CMO IT Services technician will assist you.

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