Raise a query with the Outlook developers. Users with modern authentication-enabled accounts (Microsoft 365 or Office 365 accounts or on-premises accounts using hybrid modern authentication) have two ways to set up their own Outlook for iOS and Android accounts: AutoDetect. If all else fails, go to Outlook Mobile 'Settings'/Help & Feedback/Contact Support. Summary: How users with modern authentication-enabled accounts can quickly set up their Outlook for iOS and Android accounts in Exchange Online.

Sync Contacts should be set to 'on' and if you wish you can 'Reset Account' which refreshes Outlook on your mobile and forces an update of the data which will subsequently add all of your contacts including any new ones. To force a sync you can always go to Outlook Mobile, pick Settings & then select the account you are syncing. Sync your or Office 365 content to an Android phone Here’s how you can get the best of the native apps on your Android Phone and sync your content without downloading the. In Accounts you should see an entry 'Automatically sync data', make sure its set to 'on'.

If they don't sync, go to Contacts on your mobile, open settings from the hamburger menu (top left). Doesn't always happen immediately either, can take a while. I think you have to create in Outlook proper (I use Outlook 2016) and they then propagate down to your mobile. I don't think Outlook on Android supports creating & then syncing contacts back up to your Exchange Server account.

How to sync office 365 android