Services Accounts are recommended to use when install application or services in infrastructure. It is dedicated account with specific privileges which use to run services, batch jobs, management tas...
Updated Sep 20, 2019
Version 1.0
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Lorribot If you need definitive answers, why are you reading a community article and asking the community? Not that community members are here to serve you, but I found the answer to what you are looking for in about 30 seconds of Googling over on https://docs.microsoft.com/en-us/windows-server/security/group-managed-service-accounts/getting-started-with-group-managed-service-accounts. In this article you will see the scope is domain, so this means the domain schema matters, not the forest schema.
If you have a problem with free information, perhaps you should take it upon yourself to find the answers you are looking for rather than complain to people who are just trying to help. My comment was merely to help steer you in the right direction. You're not the only one dealing with a complex environment, so don't assume community members are below you.
You're welcome for the free information.