New Xfinity box not recognized by Samsung TV

@XfinityRay​ With this tv, there is a row of apps at the bottom of the screen when using the Samsung remote. We used to be able to go into Netflix or prime, then go back to the bottom and select Xfinity. Now that button is gone. We get the message device not recognized. So to switch back to Xfinity, we have to exit all the way out of the other apps. I’ve connected other things, and the HDMI cable and port are both working, and it worked fine until I swapped out the box I’d had for 7 years or so a few days ago. 

Thank you for letting us know all the steps you have taken. I can imagine how frustrating this is. Do you happen to have another HDMI cable handy to swap out? 

I literally mentioned doing that in my original post. I thought someone with Samsung TVs was going to help?  I’m surprised you didn’t ask if I tried disconnecting and reconnecting everything. There are dozens of posts of people having the same issue, and yet someone from Xfinity tries to “help” by mentioning the same thing over and over and over. 

I apologize for that. Since this seems to be an issue with the Samsung TV, I found these steps to take:

Disconnect the HDMI cable from the back of the TV and the external device. Then reconnect it firmly to the external device first, then connect it to your TV. If it still doesn't work, try the cable in a different port. Don't forget to select the new source.

I hope this helps, let me know if it doesn't and we will continue to find a solution. Thank you. 

This did not help. It was also mentioned earlier in this help thread and was the first thing I tried, just before swapping out the hdmi cable.