Remote disk management is best handled within Server Manager. The old disk management cannot handle remote management.
Even then, there may be some firewall settings required. I haven't gone through these in detail, so my first recommendation would be to try Server Manager for remote disk management. If that still does not work, then add these firewall rules.
Set-NetFirewallRule –Name “RVM-VDS-In-TCP” –Enabled True -Profile Any
Set-NetFirewallRule –Name “RVM-VDSLDR-In-TCP” –Enabled True -Profile Any
Set-NetFirewallRule –Name “RVM-RPCSS-In-TCP” –Enabled True -Profile Any
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