XB7 - XFINITYWIFI interferring with my Unifi access points - cannot find a way to disable . HELP !

I using the XB7 as a modem & wired router, but not for Wifi. I have Wifi disabled for both 2.4 GHz and 5 GHz bands in the router configuration at https://myrouter.io .

Nevertheless, the modem still broadcasts a Wifi network on XFINITYWIFI and XFINITY SSIDs. I know my XB7 is broadcasting it because the connection from my smartphone to XFINITYWIFI cuts off when I power off my XB7.

The problem is that my 5 Unifi NanoHD meshed access points setup on VHT160 are picking this up as interference, and either keep switching channels, or I get greatly reduced bandwidth from my clients.

I have looked at the instructions at https://www.xfinity.com/support/articles/disable-xfinity-wifi-home-hotspot .

First, I logged in to https://customer.xfinity.com/#/settings/security/hotspot .

I received the error : "We are having trouble accessing this data. Please try again later."

..

Second, I installed the Xfinity app on my Android phone (S22 Ultra).

I logged in and went to the "Connect" tab at the bottom.

I am unable to proceed with step 4 "See network".

The "See network" option just does not appear in the app.

This is the screen I actually see :

If I click "Xfinity Wifi hotspots", it shows a map of my neighborhood. My home is not shown as being a Wifi hotspot on the map, yet the XB7 is most definitely broadcasting XFINITY and XFINITYWIFI.

How can I stop the XB7 from doing so ? Please help. This is really messing up with my access points.