[–] willcate 4y ago ↗ To my knowledge that feature has long since been removed.https://support.apple.com/en-us/HT204592
[–] uniqueuid 4y ago ↗ You can use mac-to-mac airplay, but it's only available on the latest version (beta) of Monterey and only if you're using a modern mac (which I assume your iMac is).https://www.apple.com/macos/monterey/features/
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[ 3.6 ms ] story [ 20.6 ms ] threadhttps://support.apple.com/en-us/HT204592
https://www.apple.com/macos/monterey/features/