xfinity stream app on Samsung smart tv

Hi, I'm trying to stream live TV on my Samsung smart TV using the xfinity stream app and the whole experience is very very bad.

For a few days, the live stream was working fine, then  a "TVAPP-00101" error started popping up several times during the day and the app would stop working. Then for several days, the app was asking for reauthorization in a daily basis. Now, it has been about a day that I can't even start the app. It asks for authorization, but when I do it I get the message "This device can only access Xfinity stream on your in-home network". The TV is connected to the in-home network and I have only one account. I don't understand what the problem is...

I've tried everything I found online in order to fix this issue but nothing works... I have checked the wifi connection, rebooted the wifi, reinstalled the app, etc. Nothing can fix it... The app works fine on my phone but not on the TV which is really frustrating...  Could you help me with that?