How to Fix “Error Code 91 – Unable to Join Party” in Fortnite?

When players attempt to join a friend’s party or lobby in Fortnite, they frequently encounter the error “Unable to join party” followed by error code 91. This error prevents users from gaming with their friends and disrupts their overall experience. The primary cause of this issue tends to be internet connectivity problems.

Other contributing factors may include corrupted game files, Fortnite or Epic servers being down, or misconfigured network settings, where network settings often involve DNS configurations.

In this article, we’ll explore various solutions to resolve this error.

1. Check Server Status

The first step should always be to verify the status of Epic’s servers and check for any ongoing maintenance. You can check the status on Epic’s website.

2. Check Internet Connection

Measure your internet speed on websites like Fast or Speedtest to ensure you have a stable and swift connection. If you’re experiencing slow internet speeds, consider restarting your router or modem, or contact your Internet Service Provider (ISP) for assistance.

Should you be connected via Wi-Fi, consider switching to an Ethernet cable for increased stability and performance.

3. Ask your Friend to Change Party Settings

If your friend’s party settings are on private or invite-only, you might encounter difficulties joining. Have them change the settings to make the party joinable by friends to avoid such issues.

1. Access the Fortnite settings, and navigate to the Social Privacy tab.
2. Adjust the ‘Party Joinability‘ option to Everyone/Friends.
   

4. Verify Game Files

Corrupted game files can lead to various issues, including this error. Verifying the files will check all installed files against the originals and download any required replacements, potentially resolving the problem.

1. Launch the Epic Games Launcher.
2. Locate Fortnite in your Library.
3. Click the three dots to the right of the game.
4. Select Manage.
   
5. Press the Verify button.
   

5. Reinstall Fortnite

If none of the above solutions have worked for you, consider reinstalling the game. This action will delete all existing game files and replace them with a fresh, uncorrupted installation.

1. Open the Epic Games Launcher.
2. Find Fortnite in the Library.
3. Click the three dots next to the game listing.
4. Confirm by clicking on Uninstall.
   
5. Proceed to reinstall Fortnite following the prompts.