Troubleshooting Guide
If MECCHA CHAMELEON says your authentication token is invalid, use this checklist to refresh Steam auth and get back into matches fast.
Short answer
The invalid authentication token error almost always means Steam session state, version mismatch, or cached login data went stale. Start with a relogin and file verification before reinstalling.
Problem Summary
If MECCHA CHAMELEON says your authentication token is invalid, use this checklist to refresh Steam auth and get back into matches fast.
The invalid authentication token error almost always means Steam session state, version mismatch, or cached login data went stale. Start with a relogin and file verification before reinstalling.
Check player reports, bugs, and server issue discussions.
Open source →Step-by-step checklist
Start here before changing files or reinstalling the game.
Run this check, then move to the next step only if the issue remains.
Run this check, then move to the next step only if the issue remains.
Run this check, then move to the next step only if the issue remains.
Run this check, then move to the next step only if the issue remains.
Run this check, then move to the next step only if the issue remains.
Run this check, then move to the next step only if the issue remains.
Run this check, then move to the next step only if the issue remains.
Run this check, then move to the next step only if the issue remains.
Do
Don't
FAQ
It usually means the game and Steam disagree about your current login session, version, or cached token state. Logging out, relaunching, and updating solve most cases.
Sometimes, but it is rarely the fastest first step. Restart Steam, verify files, and refresh your login before you spend time on a full reinstall.
Check the latest patch notes and server-status page. Patch-day auth bugs often affect many players at the same time.