Migrate Meetings Manually using Meeting Migration ...
Meeting Migration Service (MMS) automatically updates meeting coordinates for users who are migrating from on-premises to Skype for Business Online. To learn all about MMS, please refer to http://aka.ms/sa-mms.
Based on customer feedback, we added this functionality which allow admins to run MMS manually for a user.
Here is an example that kicks off meeting migration for the user John@contoso.com: