No. The primary front-end server is automatically assigned to users.
“Get-CsUserPoolInfo” cmdlet returns information about the Registrar pool, backup Registrar pool, and User Services pool that a user has been assigned to.
For reference, you can read the routing groups section in this article to learn more: https://video2.skills-academy.com/en-us/archive/blogs/rischwen/lync-2013-high-availability-deep-dive-architecture.
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