The Migration account is created for the sole purpose of the migration and with intent to be removed at the end of the migration.
Below is a script that can be used to remove this migrator account after the migration has been finished.
The first attachment "Remove-Migration-Account-From-Teams_Final_Review.txt" file provides info as how to use this script for cleaning.
The second attachment "Remove-Migration-Account-From-Teams.ps1" is the script itself.
*Disclaimer*The information in the script provided is known to work successfully. If any of these instructions are changed and/or incorrectly used, intentionally or unintentionally, this solution becomes unsupported by Quest Support and Development.
*** Please Note***
For target tenant, if the migration account is the only owner of the target team then the account will not be removed as every team must has an owner.
Also this Script is intended to remove the Migration Admin account. Do not use this if you wish to keep the Migration Admin account.