Despite a now deleted tweet from YouTube is support account that seemingly indicated otherwise YouTube premium subscribers can no longer sign up to test YouTube is picture in picture qualities on iOS. Picture in picture has disappeared from YouTube list of available experimental qualities where it was previously listed with an April 8th expiry date.
9 to 5 Google reports that some users are seeing the quality you are trying has been that the best has ended. Both 9 to 5 Google and I more add that the quality is still working on accounts that previously signed up for the test.
The tweet was posed in response to a user asking about a previous test of the quality which was available to YouTube premium subscribers. Just last month the search giant brought picture in picture support to its you tube TV services on iOS and accordingly to Google spoke person Allison to the tweet was refreshing to YouTube TV support account has now tweeted again with the corrected information.
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Picture in picture support is available for video services, generally at a system level for both iPhone and iPad but YouTube support for the quality has been spotty requiring work around like watching it through a browser rather than via its native app. But YouTube is a premium test made the features much more seamless and it allowed viewers to continue watching after they navigate away from the main YouTube app.