2.4GHz device connection

I have a camera that only works on a 2.4GHz WiFi signal.  My XB8 router is set up to connect devices to the fastest signal (5GHz or 6 GHz).  This prevents my camera from connecting.  There is no manual settings in the Xfinity app to do this and trying to log in directly to the Xfinity router is blocked by a use the app message. How can I split the signals on an XB8 to allow this camera to connect directly to the 2.4GHz signal?