xfinity stream app not casting to vizio with built in chromecast (all other streaming services working)

Hello there! Thank you for contacting our Xfinity Support Team over our Forums. We are happy to work with you on the Xfinity Stream issues today to get that correctly working, so you can cast. In order to get started, can you please send me a private message to Xfinity Support with your full name and full address by clicking the chat icon in the top right?

Mine has not been working for over the past week as well