Ivanti UWM
MoveMachinesforMC - PowerShell GUI - move multiple machines from one deployment group to another
Version 10.1-2018.3 tested. Will not work on older versions without a code change (commented in code).
Credit goes to Matt W. from Ivanti for the basic functional part of the script:
https://www.ivanti.com/blog/appsense-management-server-web-services-api-overview