Can't chromecast streaming services on T-mobile Home Internet

Nar wrote:

I m having problem casting netflix or youtube or any streaming services on T-Mobile home internet. I had no issues when I was on Cox internet. I've reboot my phone and the chromecast.  I can mirror cast my phone screen but just can't cast any streaming services. Whenever I try to cast it, my tv screen goes dark for a few seconds and then it goes back to the Google chromecast screen saver. Not sure what else to do. Has anyone had this issue? 

I have found the solution, T-Mobile Home internet Round Box emits 2 signals 2.4Ghz and 5Ghz, they need to be separated not only by their respective channels, but the names and PASSWORDs need to be different. That's the only way the signals won't bounce and mix.

Once T-Mobile rep told me to do that. It works fine now. I can finally cast from my Galaxy S20 to my Sony Android X1 Android TV with build-in Chromecast, via Google Home App. (Samsung's Smart View does  NOT support direct cast any more :( ...)