End user would like to know whether we can remove Citrix Admin Account from the domain Built-in Account Operators group.

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Instructions

The Account Operators group grants limited account creation privileges to a user.
Members of this group can create and modify most types of accounts, including accounts for users, Local groups, and Global groups. Group members can log in locally to domain controllers.

It is NOT necessary for Citrix Admin Account. 

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https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/manage/understand-security-groups