On minecraft i changed my username for java and now i cant do multiplayer

Jay Lee 0 Reputation points
2026-08-06T17:35:44.3733333+00:00

Whenever i try joining a server any server i get a thing come up say not authenticated on minecraft.net and my mod called essential which is used for multiplayer without using a server always says cannot connect

Windows for home | Windows 11 | Accounts, profiles, and login
0 comments

1 answer

Sort by: Most helpful
Most helpful Newest Oldest
  1. Emma1-N 10,135 Reputation points Microsoft External Staff Moderator
    2026-08-06T23:45:32.3633333+00:00

    Welcome Jay Lee,

    I understand how frustrating it can be after changing your Minecraft: Java Edition username, you can no longer join multiplayer servers and receive the error "Not authenticated with minecraft.net." 

    Before proceeding, I would like to narrow down the issue:  

    • Did the issue start immediately after changing the Java Edition username? 
    • Are you signed into the Minecraft Launcher with the same Microsoft account that owns Minecraft: Java Edition? 

    In the meantime, you can try these steps below to troubleshoot the issue:  

    Option 1: Sign out and back into the Minecraft Launcher  

    • Open Minecraft Launcher 
    • Click your profile and select Sign Out 
    • Close the launcher completely 
    • Sign back in with the Microsoft account that owns Minecraft Java Edition 

    Option 2: Verify your username change was applied correctly  

    Option 3: Clear launcher authentication data  

    • Close Minecraft Launcher 
    • Press Windows + R, type %appdata% and press Enter 
    • Open the .minecraft folder 
    • Delete the webcache folder if present 
    • Launch Minecraft and sign in again 

    Option 4: Update or reinstall the Minecraft Launcher  

    • Open Microsoft Store 
    • Check for updates to Minecraft Launcher 
    • If already updated, uninstall and reinstall the launcher 

    I hope the steps above help you deal with your issue. 

    If the answer is helpful, please click "Yes". If you have extra questions about this answer, please click "Comment".   

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.  

    Was this answer helpful?

Your answer

Answers can be marked as 'Accepted' by the question author and 'Recommended' by moderators, which helps users know the answer solved the author's problem.