
Check for an update before you try to AirPlay from your Mac. Update your TV software: It’s always wise to keep your smart TV current with the latest software upgrades.

Connect to the same wireless network: For the best results with getting AirPlay up and running, connect your Mac and smart TV to the same Wi-Fi network before turning on AirPlay.
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To make sure your TV can AirPlay, check with the manufacturer or browse this list of AirPlay 2-compatible TVs. Roku TVs and streaming devices and several Samsung, LG, Sony, and Vizio smart TVs come with with AirPlay turned on.
