If you are unable to find a Domain user to add into Splashtop Center, please check the following:
- Is the server running Splashtop Center on the same domain as the Active Directory server? It needs to be.
- When you check for a user, does it show a user, but not the user account you are looking for? You may need to type in the full domain name before clicking "Check".
- Do the license details show Active Directory support?