Xfinity App access no longer allowed?

Firm ware ver V2.3.1.60

Surfboard Model SB6190

NG support had me access advance settings and make changes to correct connection issues I was having with my Amazon, Nest and other devices.  The tech suggested it was needed because of either an update or power outage may have caused settings to be error set.

All other internest apps on all four Apple devices work properly.  ONLY the Xfinity apps fail to read the needed infromation from the wifi connection.

I bought the Orbi unit from Best Buy.  I had never seen it before I entering the store as I was looking for an option to the Comcast equipment that was constantly dropping my camera feeds and many of my other numerous (now47) wifi connected devices.  It worked perfectly for over a year.  This issue became very apparent after a storm/power outage reset.  First my Amazon equipment was a problem and during a support call with them the issue became more wide spread and they had me call NG support.  It appeared everything was corrected and back to normal but the next day my wife complained she could not stream TV via the Xfinity app in checking I fould that none of my Apply devices could access their apps.  I assumed (still do I think) that is was Xfiniry problem but their tech that showed up says it is the router.  So I am dead in the water for a resoultion.