Hi & welcome to the RR forums!
Numerous possibilities here. Can you elaborate on "won't come through"? Perhaps provide a video clip of what your scanner is or isn't doing? For starters you never specified what scanner you are using, this info would be quite helpful for us to help you. If using a Uniden scanner you'll want to make sure the "Law Dispatch" service type is enabled. Are you able to hear non-Canton police traffic (anything else) on the system? I'm seeing numerous simulcast cells on that system but looks like none of them are in Fulton County, so I can't rule out for sure if
simulcast distortion could be a factor. Feel free to let us know what site(s) you are monitoring if you can. Let us know