If the JustWatch search functionality is not working on your Fire Stick, here are the steps to troubleshoot and potentially resolve the issue:

1. Clear the App Cache and Data:
- Navigate to the Settings on your Fire Stick.
- Select Applications.
- Choose Manage Installed Applications.
- Scroll and find the JustWatch app, then select it.
- Click on Clear Cache and Clear Data. This helps remove any corrupt files that may be causing the search function to fail.

2. Uninstall and Reinstall the App:
- From the same menu where you found the JustWatch app, select Uninstall.
- After uninstallation, go to the Appstore on your Fire Stick and reinstall the JustWatch app.
- This ensures you have the latest version of the app which may have patches for any existing bugs.

3. Restart Your Fire Stick:
- While still in the Settings menu, go to My Fire TV.
- Select Restart to reboot your Fire Stick. This can clear temporary issues affecting app performance.

4. Check for Software Updates:
- Ensure that your Fire Stick is running the latest software version. Go to Settings > My Fire TV > About > Check for Updates. If an update is available, install it as it may resolve compatibility issues with the JustWatch app.

5. Consider App Permissions:
- If the search is still not functioning, check if the app has the necessary permissions. Go back to Settings > Applications > Manage Installed Applications > JustWatch and review its permissions.

6. Look for Policy Changes:
- Note that Amazon has made changes regarding how apps on Fire TV interact with others. This may affect how JustWatch works with streaming apps. Periodic checks on updates from Amazon regarding your specific apps may be useful - learn more - learn more.

By following these steps, you should be able to restore the search functionality on the JustWatch app for your Fire Stick. If issues continue, consider reaching out to JustWatch support for further assistance.

Troubleshooting JustWatch app on Fire TV