I tried to remote as well but received the same error. Then I started researching on how to find the users that are logged in, so that he may communicate with them and ask them to log off, but this brought a very limited amount of information. I found out that the class Win32_LoggedOnUsers doesn't really give you that information, but then I found out that there is a way to bypass the maximum number of connections by using the following command:
%systemroot%\system32\mstsc.exe /adminOnce I logged in I was able to go through the Task Manager and find and log off the extra user, but I was not happy with this solution. I feel like it might not always work. After further looking into this issue I found in Learn-PowerShell that I was able to use the WMI Class Win32_Process to get the Explorer.exe process and get the Owner, thus revealing the logged on users.
Script found in sauce:
But I didn't quite need all this so I simply made a one line :
Now I am able to find out the users that are logged in without having to remote into the server.
Hope this might help other people out there!