To resolve the issue of the NFL Fantasy Football app prompting you to update but displaying no available updates, follow these steps:

1. Check Your Device's App Store:
- Open the Google Play Store (for Android) or the Apple App Store (for iOS).
- Search for "NFL Fantasy Football" in the search bar to see if an update is available directly from the app listing. Sometimes, there may be an update that doesn't automatically show up in notifications.

2. Check for System Updates:
- Make sure your device's operating system is up-to-date.
- On Windows, go to Settings > Update & Security > Windows Update and click "Check for updates".
- Updating your operating system can resolve compatibility issues with the app.

3. Uninstall and Reinstall the App:
- If the update is still not visible, you might want to uninstall the app completely. To do this, long-press on the app icon and select "Uninstall".
- After uninstalling, re-download the NFL Fantasy Football app from the appropriate app store. This often resolves underlying issues, including outdated versions that are still cached.

4. Clear App Cache and Data (for Android devices):
- Go to Settings > Apps > NFL Fantasy Football > Storage.
- Clear Cache and Clear Data. This can often fix issues related to app performance and prompts for updates.

5. Check Your Internet Connection:
- Ensure you have a stable internet connection as network issues can sometimes hinder the app's ability to check for updates - learn more - learn more.

6. Refer to Support Pages or Community Reports:
- If the app continues to prompt for an update with no solution, you may want to visit the NFL support page for further assistance - learn more.
- Checking community forums such as Reddit may provide insights or similar user experiences that can lead to potential fixes - learn more - learn more.

If you follow these steps and the issue persists, reach out to NFL support for further troubleshooting guidance.