Group managed service accounts (gMSA)

Recently changed AD access from Service Managed Accounts (MSA) to Group Managed Service Accounts (gMSA)

Application SIA account and Web Servers Apache Tomcat connect to gMSA without issue. I can also log in to BI and CMC using admin account. What I cannot do is change the Windows AD Name within CMC “The Active Directory authentication plugin failed to verify the administration credentials for the user”
Also, cannot log in using AD user name.

Biscally, how do I change the AD application in CMC authentication to use gMSA if the password is unknown?

Like many other web.config files, I can specify “Integrated Security=True”. How is this possible with Business Objects?