You can follow along here.
https://learn.microsoft.com/en-us/windows-server-essentials/install/add-windows-server-essentials-as-a-member-server
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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I have ms server 2012r2 as domain controller and need to install new ms server 2019 essentials. Can server 2019 essentials join the 2012r2 domain
You can follow along here.
https://learn.microsoft.com/en-us/windows-server-essentials/install/add-windows-server-essentials-as-a-member-server
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
Hello there,
If configured as a Domain Controller, Windows Server 2019 Essentials must be the only Domain Controller, must run all Flexible Single Master Operations (FSMO) roles, and cannot have two-way trusts with other Active Directory domains.
we can only have one Essentials server in one domain, and it must hold the master FSMO roles. You can add member servers but they should not be other Essentials servers.
Hope this resolves your Query !!
--If the reply is helpful, please Upvote and Accept it as an answer--