Xfinity App Will not show my connected modem

I have been having issues with my Xfinity Services over the past month.  I have been a customer for over 20 years and have had so many issues recently.  This all started last Friday after Xfinity completed "routine maintenance in my area".  I received a message that "maintenance was complete" but none of my TV boxes worked.  I worked with customer service who could not fix the issue so scheduled an appointment for Monday.  I was called back by an agent from Advanced Technical Support who fixed the issue and then cancelled the appointment.  Within 15 minutes all of my TV boxes went offline again with the same issue but Advanced Technical Support couldn't help since I did not have a "ticket" any longer as my tech appointment was cancelled.  I was also told my equipment needed to be updated.  I was scheduled to be out of town for the weekend so just left things "as is" until Sunday evening after I received a new internet modem and TV box.  I worked with an agent to activate and install the new equipment.  TV boxes were fixed "one by one" so that was positive.  On to the internet/voice/ modem.  There is an option in setting up a new modem to "set up with the same Gateway name/credentials" and I asked the technician to do that.  I was informed the he was unable to get that to work so I gave him my existing information so that all of mf devices would see the same WIFI name/password, etc.  Internet, phone and Television services all worked.  However, now my Xfinity app will not see my new modem.  I cannot look at connected devices or manage my internet with the Xfinity App (which is necessary since I am always referred to this app when having issues).  I cannot see if my Xfinity Pod is actually connected, etc.  If I log directly into my modem (10.0.0.1/) I can see the connected devices.  I called again on Monday night to discuss with Advanced Technical Support.  Spent about an hour troubleshooting.  Reinstalled my internet modem, logged in an out of the Xfinity App, uninstalled the Xfinity App/ reinstalled but still didn't work.  After the technician couldn't resolve the issue, I was informed my case would be escalated and I would get a call back within 2 hours but since it was later in the evening, I would get a call by Tuesday morning.  I did not get a call so I called back Tuesday evening.  I was then told that there was maintenance being performed on the Xfinity App in my location and would be resolved by today.  (Why is this now the issue???)  I was told that the issue with the Xfinity app has been ongoing since the end of January even though my issue only started with the installation/activation of the new modem.   I still have the same error issue but I do get a notification from the Xfinity app when a new device is connected to my internet so there must be something else that is interfering.   If I go to https://www.xfinity.com/support via my web browser, it lists two modems on my account - one that is offline so I am wondering if my Xfinity app is routed to that old modem???  I have attached some screen captures in the hopes that I can finally get this issue resolved.