Steps to migrate existing on-premises users to Microsoft Outlook Online using modern authentication

Step	Action
	Configure modern authentication and and validate that it is working correctly.
	Migrate user mailboxes from your on-premises Microsoft Exchange server to Microsoft Exchange Online . After the migration completes, users will receive a prompt to log in to their mailboxes. Wait while the BlackBerry Dynamics apps trigger autodiscover and connect to the new mailbox location. The amount of time this takes depends on how many users have been migrated and how often BlackBerry Work is opened. Refer to the Last Contact Time and container activity report to estimate whether users have received the new mailbox configuration from autodiscover. Do not proceed to the next step until all users have authenticated.
	Assign the app configuration with the correct modern authentication settings to users. For BlackBerry Work for iOS and Android, see Configure BlackBerry Work for iOS and Android app settings for Office 365 modern authentication. For BlackBerry Work for Windows and macOS, see Configure BlackBerry Work for Windows and macOS app settings for Office 365 modern authentication. For BlackBerry Notes and Tasks, see Configure BlackBerry Notes and BlackBerry Tasks app settings for Office 365 modern authentication.