Hi there, thanks for the tweet. What do you see on your TV when you try to cast YouTube? Do your other phones or tablets able to cast YouTube? Try checking for system updates on your phone to see if it'll work.
@MorkaiAU Appreciate your efforts in trying to fix this issue. As a next step, we recommend sending a feedback report with these steps: https://yt.be/help/feedback . You may not get a direct response, but we review all the details and use them to investigate and fix issues.