By design, Windows Server allows just two concurrent Remote Desktop sessions for administrative purposes. To go beyond that, you’ll need to configure Remote Desktop Services (RDS) and purchase the appropriate Client Access Licenses (CALs).
The process involves installing the Remote Desktop Session Host role, setting up the Remote Desktop Licensing role, and then activating the CALs that match the number of users you want to support. Once this is done, you can allow multiple users to connect simultaneously without hitting the two‑user restriction. This is the supported and secure way to expand access for your team.
In short, the limitation you’re seeing is expected behavior, and the path forward is to deploy RDS with CALs. I hope this explanation gives you a clear direction and helps you plan the next steps. If you find this answer helpful, please consider clicking Accept Answer so others can benefit too.
Jason.