Wifi 6 AX Settings

I am trying to set my XB7 to use the AX setting for wifi 6 for my iphone 12 PRO MAX
I go to activate it on the XFI app under advanced settings 2.5/5G it says successful when I go back it never changed the setting 

I next tried to go in 10.0.0.1 on my mac to change it says it went through and when I go back to the previous page it shows it changed but when I go back to Xfinity (formerly XFI) it says nothing changed
I called tech support they couldn't change it they said that option was taken away from them when XFI was launched

here is my software info incase you need it

can someone help me get it working (Comcast Employee Prefered) thank you so much