
Hi @shashank , thank you for posting in the Q&A forum.
Quoting this document: SharePoint 2019 licensing:
SharePoint Server 2019 is required for each running instance of the software, and CALs (Client Access License) are required for each person or device accessing a SharePoint Server.
That is to say, if you need to build three separate SharePoint Server 2019 environments, then you will need three separate licenses to get access to them.
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