Not sure I understand. Are you trying to physically hook an Apple TV to your Mac or trying to get them "hooked" to the same account?
If the former then what are you trying to accomplish and how are you attempting this? 😕 The Apple TV USB I believe is for service only and you can't hook HDMI out to USB.
If the latter then along as both are signed into the same account on on the same WiFi you should be able to see all content on both.