Before connecting to a Minecraft server, Mojang automatically checks if your account is real before allowing you to join to protect the server. When this fails, it displays Failed to verify username as the error message. If this happens to you, there may be a simple solution available depending on the cause.
# Using Multiple Sessions
Validation errors most commonly occur when Mojang detects multiple instances of the same login credentials. This is caused by logging in to your account while already logged in on a different device, or using multiple Minecraft launchers. Logging in and out of your account generally re-validates the session, fixing the issue.
- Close your Minecraft client if it's running
- On the Minecraft launcher, log out of your account
- Log back into your account, then launch Minecraft again
# Using a Non-Verified Account
By default, Minecraft servers only allow players with premium accounts to join. This can be bypassed by disabling online mode on your server.
Players with non-premium, or cracked accounts, will receive validation errors when joining servers with online mode enabled. Please note that this will only be the solution to your validation errors if you or someone joining your server is using a non-premium account.
# Mojang Server Downtime
If Mojang’s authentication servers are offline, your account cannot be verified. When this occurs, you will need to wait until the authentication servers are back up again.
You can check the Mojang server status' with the Mojang Status page on their help site. You can also follow the official @MojangStatus X/Twitter account for updates on all Minecraft and Mojang services.
