Sync Contacts between Outlook and iOS Devices
If you would like to enable the sharing follow this guide:
1. From your phone, go to Settings, then select Contacts.
2. Tap the entry for Accounts, and then select your Microsoft 365 account.
3. Turn on the switch for Contacts (Figure A).
Figure A
Sync your iPhone contacts with Microsoft 365.
4. Check your contacts in Outlook and on your iPhone to confirm that they’re in sync.