Apple has seeded tvOS 15.4 release candidate to developers for testing. The build number is 19L440.
tvOS 15.4 brings support for captive Wi-Fi networks and some video player and spatial audio control tweaks.
Captive Wi-Fi network support on tvOS allows you to use your iPhone or iPad to connect your Apple TV to networks that need additional sign-in steps, like at hotels or dorms.
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