SCP fails to connect to Solarwinds SCP server

I have installed the solarwinds free SFTP/SCP server and can connect and transfer well with SFTP but when I try to connect with the SCP it fails at winscp but shows as "Authenticated user ozz from IP 10.10.41.3." On the winscp client the error is "Server refused to that a shell command" and it says "Authentication failed".
I would appreciate any help on this issue. Thanks.

I do not know Solarwind SCP server. In general, WinSCP cannot work with any SCP server. WinSCP actually requires a shell access to implement some of the functionality. If you SCP server does not provide shell access, you cannot use it with WinSCP. See also https://winscp.net/eng/docs/requirements#scp
Anyway, using SFTP is always recommended over SCP. Any particular reason you want to use SCP?