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I am signed in to YouTube Premium on the app, but I am not automatically signed in with the same account on Safari. I manually signed in with another Google account there. In fact, once in a long while I am logged out and need to sign in again. Not sure why it seems to work differently for you.
 
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Is this possible ?



Just to clarify, are you talking about getting the video to open in the YouTube App straight away after clicking on it on the website? If so you need to click on the title area right here:
7385A63B-C1AD-4756-A5ED-779814B75975.jpeg
 
Not sure what you're asking, as above.

If you sign into a Google app, all other Google apps will be signed in, as that's a convenience feature of Google (and Microsoft and others) and their sandbox in iOS. Won't sign in on Safari automatically as that is a different sandbox vs Apple's/Safari sandbox.
 
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