Hi Diego Ercolani
1.Under the SPLA license agreement, you purchase a Remote Desktop Services Subscriber Access License (RDS SAL) for each user or device connected to the terminal server. In addition, if you plan to install Microsoft Office on a terminal server, you will also need to purchase the Office Subscriber Access License (Office SAL) for each user or device that connects to the terminal server. If you only want to allow two people to connect to the terminal server without violating the license, you can use administrator session mode, which does not require RDS SAL. However, this model can only be used for administrative purposes, not to provide software services or applications to customers. Also, if you install Office LTSC 2021 in administrator session mode, you still need to purchase Office LTSC 2021 SALs per user, and only two users can use Office at the same time. You can install the Remote Desktop Services role on Windows Server 2019 or Windows Server 2016 to provide Terminal Server functionality. Note that if you use Windows Server 2019 Standard, you can allow up to 2 simultaneous users or devices. If you need more connectivity, you'll need to upgrade to Windows Server 2019 Datacenter Edition or purchase additional RDS SAL.
2.To deploy Terminal Server, you need to use the Windows Server operating system and enable the RDS role in Server Manager. You can use Windows Server 2019, Windows Server 2016, or Windows Server 2012 R2 to deploy Terminal Server. You also need to configure a licensing server to store and manage RDS SALs and Office LTSC 2021 SAL.
For more information, please refer to Licensing Options: Service Providers | Microsoft Volume Licensing
Hope it helps.
Kind regards,
Lei