By following these steps outlined in this guide, you should be able to get your YouTube TV NBC channel back up and running. 

Important Factors that can trigger YouTube TV NBC channel not working includes:

• Location restrictions: YouTube TV is only available in certain areas of the United States. If you're outside of the service area, you won't be able to access NBC or any other channel on YouTube TV.
• Network availability: NBC is a local channel. It's only available in certain areas, so if you're not in one of the supported regions, you won't be able to access the channel.
• Weak internet connection: YouTube TV requires a high-speed internet connection to stream content. If your connection is too slow or unstable, you won't be able to watch NBC or any other channel on YouTube TV.
• Outdated software: YouTube TV is always updating its software to ensure that you have the best experience possible. If your device is running an outdated version of the YouTube TV app, you may encounter problems when trying to watch NBC or any other channel.
• Technical issues: YouTube TV is a relatively new service, so technical issues are not uncommon. You may experience problems accessing NBC or other channels due to glitches or other technical issues.
• Data usage: YouTube TV can be data intensive, so you may experience problems if you’ve exceeded your data limit.
• Geoblocking: Certain content may be blocked for certain geographic regions. This means that if you’re in a region where the content is restricted, you won't be able to access it.
• Server issues: YouTube TV’s servers can experience problems from time to time. If this is the case, you may not be able to access NBC or any other channel on YouTube TV.
• Outdated hardware: YouTube TV requires compatible hardware to stream content. If your device is outdated or not supported, you won’t be able to watch NBC or any other channel on YouTube TV.
• Streaming services: YouTube TV isn't the only streaming service available. If you're using a third-party streaming service, such as Sling TV or DirecTV Now, you may not be able to access NBC or any other channel on YouTube TV.