This is likely to be the double hop issue, your credentials are not valid beyond the scope of the first server.
Can you do the command with the option:
-Authentication CredSSP
Rather than Negotiate
.
You will also need to specify credentials manually using the -Credentials
flag as well as set up the client and server for CredSSP:
Enable-WSManCredSSP -Role Client -DelegateComputer HOSTNAME -Force
Enable-WSManCredSSP -Role Server -Force
The steps are explained in more detail here.