How to synchronize Office Professional Outlook 2019 with Outlook phone app

Outlook 2019 and Outlook for Android must contain the same Microsoft 365/Exchange account, with appointments saved in that account’s mailbox calendar rather than another or device-only calendar.

1. Confirm the account and calendar in Outlook 2019

1. In Outlook 2019, select File → Account Settings → Account Settings.
2. On the Email tab, note the full email address and verify its type is Microsoft Exchange or Microsoft 365.
3. Open Calendar and look in the left pane under My Calendars.
4. Create a test appointment specifically in the calendar belonging to that email address.

Exchange mailbox calendars synchronize through the Exchange server; IMAP and POP accounts synchronize email only, not calendars.^1^

If the appointment is placed in another account’s calendar or a local calendar, it will not appear in the Exchange calendar on the phone.

2. Add or select that same account on Android

In Outlook for Android:

1. Tap your profile picture, then Settings.
2. Under Accounts, check whether the exact email address from Outlook 2019 is listed.
3. If it is missing, select Add Account → Add Email Account.
4. Enter that same work or school email address and complete authentication, including multifactor authentication if requested.^2^
5. Open Calendar, tap the calendar/profile icon in the upper-left corner, and place a checkmark beside that account’s calendar.

Do not configure the account as IMAP or POP. Those configurations cannot synchronize calendars or contacts.^3^

3. Determine which client is not reaching Exchange

Open the Microsoft 365 or Exchange web calendar in a browser and look for the test appointment:

• Appears on the web but not Android: In Outlook for Android, open Settings → Accounts → affected account → Reset Account. Then reopen Outlook and check the calendar.^4^
• Does not appear on the web: The Outlook 2019 appointment is either in the wrong calendar or desktop Outlook is not uploading changes to Exchange. Move or recreate it in the Exchange account’s calendar.
• Appears on Android and the web but not Outlook 2019: The desktop client has the synchronization problem; check Outlook’s Sync Issues folder for an error associated with that mailbox.

If resetting the Android account does not help, remove only that account from Outlook for Android and add it again using the same Microsoft 365/Exchange address. For an organization-managed account, contact the Microsoft 365 administrator if enrollment, registration, Company Portal, or app-protection prompts prevent setup.^2^

References

1. Sync basics - what you can and cannot sync
2. Set up email in the Outlook for Android app | Microsoft Support
3. Troubleshoot Outlook mobile issues | Microsoft Support
4. Mail in Outlook not working proerly - Microsoft Q&A