Windows Remote Desktop Error 0x708
Remote Desktop Connection
Your computer could not connect to another console session on the remote computer because you already have a console session in progress.
Error code: 0x708
This means that the computer name you tried to reach is not working. Typically this can be fixed by attempting to make a remote connection to the IP Address of the device instead of the device hostname.
I know the error makes zero sense, but the solution for me is always to use the IP Address.