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I'm not sure if I'm totally understanding....I've never attempted to cast while screen is locked....
However, I cast YouTube from my my 20-Ultra to my samsung TV all the time. About 97% of the time the phone won't acknowledge the TVs availability on the first attempt. Once I reboot the phone and the TV it'll work.
I also discovered that Youtube's own TV cast button isn't available if my wifi is off. But that's a YouTube thing.
Just to clarify are you attempting to use the phone's cast feature or YouTube's cast feature?
I would recommend reaching out to Youtube support on this: https://support.google.com/youtube/#topic=9257498
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