Cable boxes "offline," cannot connect smart tv

When I go into the Xfinity app, all of my cable boxes...I have 3...show up as offline. All three are working properly with all of the features intact. However, I am trying to hook up a smart TV and I cannot complete the process with the box showing as offline. I have been on the phone with Comcast for a ridiculous amount of time this week and really don't want to call back. Anybody have any advice ora similar situation? @