cannot see any other pc on my network

Your Surface must be on a Private network, not Public.

Go to Settings → Network & Internet → Wi-Fi (or Ethernet)

Click your connected network

Set Network profile = Private

Press Win + R → type services.msc

Make sure these are Running and Automatic:

Function Discovery Provider Host

Function Discovery Resource Publication

SSDP Discovery

UPnP Device Host

Open Control Panel → Network and Sharing Center

Click Change advanced sharing settings

Under Private, make sure:

Turn on Network discovery

Turn on File and printer sharing

Turn off firewall briefly

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