For media streaming, your Mac must be able to connect to the device that you are streaming to and can communicate with it while the receiving device must be able to communicate with your Mac as well. Some router settings might cut off the communication, leading to media streaming failure. 

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To ensure you have the smoothest video streaming experience, please check your router settings for following points:

• Ensure you have the latest firmware update for your router on the manufacturer’s website.

• If you have a dual band router, use separate names for the 2.4GHz and 5Ghz network. Then make sure that both the Mac and the TV are on the same network. For example, if the Mac is on 2.4Ghz, the receiving device should also be on 2.4Ghz as well.

• If you have a router with MAC address filtering, add the MAC address of that receiving device to the list of filtered devices.

• Disable Access Point/Client isolation on your router..

• Disable IGMP Proxy on your router.

• Disable any Virtual Private Networks (VPNs) or proxy servers, on your router and/or computer.

• Enable UPnP/Multicast on your router.

• Enable IGMP on your router.