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The two WiFi bands have now been combined into one with the Comcast gateway devices.
If you are not using any Xfi Pods, you can try separating the 2.4 and the 5.0 bands and give them two different broadcast names / SSID's;
Understood ! I'm not an employee... Get your own equipment ! You'll be better off !!
@vickylmartinez Eg is correct they come combined and you can separate them if you so choose to do that. If you do not have them coming up when you seperate them try to do a factory reset on the Gateway by sticking something into the reset hole on the back of the modem for 45 seconds. You will of course have to go back and set up everything how you want.
You can also go to 10.0.0.1 and the user name is "admin" and the password is "password" by default then you can make changes in there as well as factory reset the Gateway. If you still do not have your 2.4ghz and 5ghz showing up separate as they should then you can try a different model Gateway Xfinity modem and if that doesn't work you can buy your own personal router and use it for your 2.4ghz and 5ghz.
If you're using xFi pods then you have to use them combined and the router is smart enough to pick the best one out of 2.4ghz and 5ghz for you etc.