click on computers on AppleTV, Home Sharing is turned on iMac but AppleTV gives a Retry message
When I click on Computers icon on AppleTV, Home Sharing is turned on iMac but AppleTV gives a Retry message
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They may not be on the “same network” if you use two SSID network names to differentiate between the 5 GHz and the 2.4 GHz Wi-Fi band. It is recommend to bridge both into one logical network with one SSID network name, and have the devices use whichever band they prefer.
Also try restarting all devices involved: router, Apple TV, Mac.
Use Home Sharing to share media from a computer to other devices - Apple Support