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

 The One icon 
 The Two icon 
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.
 The Three icon 
Assign the app configuration with the correct modern authentication settings to users.