Apple TV not recognizing cable subscription
Apple TV is not recognizing optimum subscription/not allowing access to HBO or Bravo
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What is your model Apple TV? Identify your Apple TV model - Apple Support
Optimum is listed as a supported TV provider, when selected on your device.
TV providers that let you sign in on your iPhone, iPad, or Apple TV - Apple Support
Use your pay TV or cable provider with Apple TV - Apple Support
Apps that let you sign in with your TV provider on your iPhone, iPad, or Apple TV - Apple Support
Note that you will need to install the separate apps of these content providers on your Apple TV box.