You haven’t mentioned how the PC is connected.
If it’s connected via wireless then check your router.
Look for settings that might be labelled multicast (isolation), igmp, upnp, wmm or AP isolation and try toggling these settings (not all at once).
Not all of these listed items will appear as different manufacturers use different terminology.
Also watch out for negative statements. e.g. Multicast should be enabled but multicast isolation should be disabled.
If none of these things are present, make sure you have the latest firmware in the router