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It’s all likely A/B testing. My TV doesn’t have it. My iPhone 11 Pro Max logged into my YT account has 4K for HDR content. My iPad Pro 12.9 2020 has 4K for all content, SDR and HDR, but only if logged OUT of YT.

Nice find, went into incognito mode in the YouTube app on my xs max. Every video I played was running at 2160p😊

most likely a bug that YouTube needs to iron out.
 
It’s all likely A/B testing. My TV doesn’t have it. My iPhone 11 Pro Max logged into my YT account has 4K for HDR content. My iPad Pro 12.9 2020 has 4K for all content, SDR and HDR, but only if logged OUT of YT.

Hmm I tried Incognito mode and fully signing out, neither made a different on my iPad Pro 11”
 
I’m able to play certain 4k videos on my iPhone SE 2nd gen.
Not all of them though, some still top out a 1080. I assume it has something to do with a codec, not sure. This was one one of the first things I noticed when I moved from my HTC 10. I had no 4k support on iOS til 14.

I haven’t installed tvOS 14, I don’t use youtube on my TV enough to care.
 
ios 14/iphone 7 - 1080p60
ipad mini 2019 /13.5.1 - 1080p, ignito mode 720
imac 2017 -2160p60(4k). loading play loadding play
apple tv 4k - 720p

** got apple tv later i try update let see.
 
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I’m able to play certain 4k videos on my iPhone SE 2nd gen.
Not all of them though, some still top out a 1080. I assume it has something to do with a codec, not sure. This was one one of the first things I noticed when I moved from my HTC 10. I had no 4k support on iOS til 14.

I haven’t installed tvOS 14, I don’t use youtube on my TV enough to care.

At least that should mean all ios 14 compatible devices should be capable to play 4k in youtube at some point.
 
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At least that should mean all ios 14 compatible devices should be capable to play 4k in youtube at some point.

still nothing on my ipad pro 2020 and Apple tv both running iOS 14 b3. I guess Youtube is doing some AB testing
 
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