Siri Switch Channel Command doesn’t work with Fox News

Using an Apple TV. When I ask Siri to switch or change the channel it works for virtually all networks. However when making the same command for Fox News channel, Siri is “unable to do that.” Why does DIRECTV allow channel commands to work with all networks besides Fox News? Is there an issue with Fox News on DIRECTV? Apple’s website says Fox News is one of the channels Siri can switch to through your provider via command. Seems like DIRECTV is what is blocking it. Why and how do I use voice command to switch to Fox News on DIRECTV?