How to Fix Error Code 2901 (Error Cause 10) in Call of Duty

If you’re encountering “Error Cause 10” with “Error Code 2901” in Call of Duty games like Modern Warfare 3 (MW3) or Black Ops 6 (BO6), you’re not alone. This issue prevents players from joining lobbies and often displays the message: “Lobby not found. Check the code and try again.”

This error typically indicates a server connectivity issue or an account authorization problem, especially for Xbox Game Pass users. In this guide, we’ll explore the possible causes and provide solutions to help you resolve the issue.

Common Causes of Error Code 2901

1. Server Issues: If Call of Duty’s servers are undergoing maintenance or experiencing high traffic, players may struggle to connect.
2. Game Pass Account Authorization Issues: Users playing through Xbox Game Pass might face this error, particularly if their Game Pass subscription is not linked to the primary account.
3. Corrupted or Missing Game Files: Damaged game files can cause connectivity issues.
4. Attempting to Join a Locked Lobby: This error sometimes occurs when players try to join a private or unavailable match.

How to Fix Error Code 2901

1. Check Call of Duty Server Status

Before troubleshooting, check if Call of Duty servers are down by visiting official sources like:

• Activision Online Services
• Downdetector

If servers are down, the best option is to wait for them to be restored.

2. Restart Your System and Network Equipment

• For Consoles & PC: Completely power off your system and unplug it for a minute before restarting.
• For Network Issues: Restart your modem/router to refresh the connection.

3. Ensure Your Game and System Are Up to Date

Keeping your game and system updated can prevent unexpected errors:

• For PC (Steam/Battle.net): Check for updates in the respective launchers.
• For Consoles (Xbox/PlayStation): Go to the system settings and update the game manually if needed.

4. Verify and Repair Game Files

Corrupted or missing files may cause Error Code 2901. Use the repair tools available for your platform:

• For Battle.net:
  1. Open Battle.net launcher.
  2. Select Call of Duty MW3 or BO6.
  3. Click the gear icon and choose Scan and Repair.
  4. Restart the game once the process is complete.
• For Steam:
  1. Open Steam and go to your game library.
  2. Right-click on the game and select Properties.
  3. Navigate to Local Files and click Verify Integrity of Game Files.
  4. Restart Steam and launch the game again.
• For Xbox Game Pass Users:
  1. Open the Xbox App.
  2. Right-click on the game and select Manage > Files > Verify and Repair.

5. Set Your Home Xbox (For Xbox Game Pass Users)

If you’re playing through Xbox Game Pass, setting your console as the Home Xbox may resolve account authorization issues.

1. Press the Xbox button on your controller.
2. Go to Profile & system > Settings > General > Personalization.
3. Select My home Xbox and choose Make this my home Xbox.
4. Restart your console and try launching the game again.

6. Avoid Certain Game Modes

Some players have reported encountering this error when trying to access private matches, training modes, or locked game modes. If you’re facing the issue, try playing standard multiplayer or zombies mode instead.

Final Thoughts

If you’ve tried all these solutions and still experience Error Code 2901, consider reaching out to Activision Support for further assistance.

By following these steps, you should be able to resolve the error and get back to gaming without interruption.