Xfinity app missing functions after upgrading gateway

I upgraded my Xfinity gateway to the new one they sent recently and went through the activation process.  Since then, the app has lost several functions including the Services icon/tab.  I also cannot access advanced settings of the gateway in the app to setup port forwarding.  In addition, when looking at my account, it appears I no longer have xFi Complete for some reason.  I have tried calling the service department, visiting my local Xfinity store, and had a serviceman at my house who installed yet another new gateway to try to fix the problem.  The serviceman was unnecessary because he did something I could have done myself - replace the gateway.  I was charged for his visit as well which I'm not happy about.  I've spent days trying to fix this problem  Does anyone have a solution?