modem configuration

I need to be able to access the modem/router settings, but this option has been disabled by Comcast on my new device which was recently installed by Comcast. The issue is that I have a Wyze Pan and Tilt webcam which uses WPA2, but I am unable to change the settings to allow this protocol on the 2.4 GHz band. This has rendered my camera unusable. As a point of interest, this camera is still for sale on Amazon and is not considered obsolete.

Is this something someone can assist me with?

Thanks in advance.