Is 2.4 ghz supported?

If you are using a Comcast rented gateway device, this may or may not apply anymore as a lot of features / functionality have / has been disabled.. YMMV.

The two WiFi bands SSID's have been combined into one with the Comcast gateway devices. Some devices get confused and don't know how to see / talk to combined SSID's.

If you are not using any Xfi Pods, you can try separating the 2.4 and the 5.0 names and give them two different broadcast names / SSID's;

https://www.xfinity.com/support/articles/change-wifi-mode-admin-tool-xfinity-xfi 

Associate the cameras with the new 2.4 SSID (broadcast name) and password.

Thanks for reaching out @user_35feb3. This might be a better question for the manufactures of the camera. I can tell you that as long as the security camera can connect to internet it should connect to Xfinity Internet with no problems. 

Not necessarily....................

@user_35feb3 

Have you had a chance to see if the info that I posted for you applies ?

I did look into it but i dont believe im qualified to be messing with the settings. It is all gibberish to me. I can tell you i only have one choice when connecting to the wifi so i believe the 2.4ghz and 5ghz are combined. If i buy 5g cameras would they connect or would i still need to seperate the two for it to connect? And id like to reiterate for Antoine the cameras will NOT connect to the wifi. All information is correct but it just will not connect. And this is happening on 2 different cameras.

@user_35feb3 

All those details are in that link including what @XfinityAirelle stated above. It's pretty easy to follow the instructions. They are written for the non-techie. Why spend money on new cameras when you may not have to ? Good luck !