Two Hurdles in PowerShell Remoting: Double-Hop Authentication and the $using: Scope
Invoke-Command reaches the server but dies on the file share, and remote blocks can't see your variables. Both problems, both fixes.
Remoting
Fix Microsoft Edit Error 0x80070006 in Enter-PSSession
Diagnose Microsoft Edit error 0x80070006 in Enter-PSSession and use SSH or PowerShell file transfer to edit remote Windows files.
PowerShell Remoting with WinRM and SSH
How to choose between WinRM and SSH for PowerShell remoting on Windows, Linux, and mixed environments.