Hello,
I'm unclear how you have the Mitel MiVoice Business Console installed? Typically in a corporate environment, the MiVB Business Console is installed on a Window 10 or Windows 11 PC that is active member of the company domain. Both the logged in user and the PC which is hosting the application are part of the domain. With that said, I have never (ever) seen a situation where the MiVB Business Console is installed on a Windows Server machine, little-own a domain controller. If its' installed on an actual domain controller (DC), would have your local Mitel Partner return and have it installed properly.