JSI Tip 6392. 'Cannot add <user> to CN <group>, because user has not been migrated to the target domain'?

When you attempt to use the Active Directory Migration Tool to migrate a user, you receive an error similar to:

Cannot add <user> to CN <group>, because user has not been migrated to the target domain.

This error will occur if you rename or move a user to a different group or or organizational unit and then immediately migrate the user to another group or OU.

You must wait a respectable amount of time (get a cup of coffee) if you want to perform the above actions.