Psexec.exe does not work

Question

I want to run some commands on a windows 8 virtual machine using psexec.

I use the command:
.\PsExec.exe \\<hyper-v server>\\<vmname> -u user -p password "cmd"

And I get that answer:
PsExec v2.34 - Execute processes remotely Copyright (C) 2001-2021 Mark Russinovich Sysinternals - www.sysinternals.com

But nothing happens on the vm with name <vmname>
The virtual machine is created in hyper-V