This operation is used to change all references to a username to a new username. Changes are only made to historic workflow data and user settings. Workflow definitions and running workflows are not changed.
NWAdmin.exe -o MigrateUser -oldUser originalUsername -newUser newUsername
The command can currently only migrate one user at a time.
Please note the following:
Full details on the use of this command can be found in the NWAdmin reference: https://community.nintex.com/docs/DOC-1026 (See page 32).