Restarting the ATV 3rd gen does not fix this, nor does putting the ATV back to factory settings. When I called Apple for tech support, all they were able to tell me was this is a vintage device and certain features are no longer applicable to it- they weren't able to help with ā€œcanā€™t sign into iCloud on AppleTV 3rd Genā€- only the standard ā€œitā€™s obsoleteā€ answer.
With this release, Apple did not drop support for any iOS devices, but support for Apple TV (3rd generation) has been dropped following the release due to 32-bit deprecations. Therefore, iOS 9 was supported on the iPhone 4S onwards, iPod Touch (5th generation) onwards, the iPad 2 onwards, and the iPad Mini (1st generation) onwards.
However, Apple still refers to the 2018 iPad Pro 11 inch as a ā€œ1st generationā€ device on its iPad models page, hence the confusion. It would seem likely that Apple is only cutting off support The Apple TV 4K and the Amazon Fire TV Stick 4K have more similarities than differences. Both play video at 60FPS, support HDR10, and Ultra HD 4K, have Dolby Vision, and Dolby Atmos. Apple TV 4K adds support for Spatial Audio and comes with an ethernet port, while the Fire TV Stick 4K supports HDR10+ and has a more attractive price point. Screen mirroring still works, AppleTV+ still works but it's slow to load. I'm not sure about the other services, I have one collecting dust I can check later to see what works. A used 4th gen or 5th gen would be better. A few months ago I was able to get brand new 1st gen Apple TV 4K 32 GB for $79 from Walmart online.

apple tv not working youtube 2gen the YouTube app is no longer available on apple tv (3rd generation). you can still watch YouTube on apple tv 4k, apple tv hd, iPhone, or iPad. With airplay> you can also stream YouTube from your iOS device directly to any apple tv (3d generation or later) for a list of supported devices, please visit yt.be/tv

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is apple tv 3rd generation still supported