xfinity stream no longer casting to google home max

Hi, xfinity stream is no longer casting to my google home max.  Other devices in my home such as the original google home display are working, so it is just an issue with the google home max.  Tried the following:

• Removing app from my android device, reinstalled and logged in.  Still doesn't work
• Rebooted router.  Still doesn't work
• Reset Google Home Max to factory settings, still doesn't work
• Checked settings in google home app to make sure casting is still allowed.  Still doesn't work
• Performed DNS Flush as instructed here: 

  https://www.minitool.com/news/error-tvapp-00100.html  - Still doesn't work

Keep getting TVAPP-00100 error message.

Other apps such as youtube, hulu and netflix work just fine, so must be a xfinity stream issue.  Anyone else have this issue, and have a fix?

Thanks in advance