Get-WmiObject : The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)

Check that the “Windows Management Instrumentation (WMI-In)” rule is enabled in the firewall for each remote machine.

Or in an Administrative Command/Powershell prompt run:

netsh advfirewall firewall set rule group="Windows Management Instrumentation (WMI)" new enable=yes

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