Thanks for reaching out. Oh no! That is not great to hear that your Google Nest Hub is suddenly not casting YouTube TV. I would be more than happy to help look into this issue. First, I have some quick questions:
Thank you for your patience, I look forward to your response.
I want to ensure you are good to go, and everything is working properly. Please let me know if you are still having trouble, as I will be locking the thread in 24 hours due to inactivity.