What is this problem
You open Mobile Legends and hit a wall: "Login Failed," an error code, or the loading screen just spins indefinitely. You can't get into your account.
Here's the important distinction: a login failure is not the same as a lost account. In the vast majority of cases, your account data is completely intact — the problem is in the authentication process, not the account itself.
Root causes
1. Linked account issues. If you log in via Facebook or Google, those platforms must be accessible and logged in on your device. A signed-out Facebook app or an expired Google session will prevent MLBB from obtaining an auth token.
2. MLBB server maintenance or outage. Scheduled maintenance or unexpected server issues make login impossible for all players simultaneously. This is usually brief.
3. Outdated or corrupted app cache. Stale cache data can interfere with the session initialization process, causing the login to fail silently.
4. Unstable internet connection. Packet loss or high latency can interrupt the authentication handshake before it completes, returning a generic login error.
5. Outdated app version. An old MLBB client may be incompatible with current server protocols, causing authentication failures.
6. VPN or firewall blocking auth requests. Some VPN services route traffic in ways that block MLBB's authentication servers specifically.
Step-by-step fix
Step 1: Check MLBB server status. Visit the official MLBB Twitter/X or Facebook page. If maintenance is underway, it will be announced — all you can do is wait for it to finish.
Step 2: Re-verify your linked account. Open the Facebook or Google app on your device and confirm you're signed in. If you've been signed out, log back in, then relaunch MLBB.
Step 3: Clear the app cache.
- Android: Settings → Apps → Mobile Legends → Storage → Clear Cache
- iOS: Delete and reinstall the app (your account is safe — it restores when you log in via Facebook/Google)
After clearing, try logging in again.
Step 4: Switch your connection type. If you're on Wi-Fi, try mobile data. If you're on mobile data, try Wi-Fi. Sometimes the issue is specific to one network path.
Step 5: Disable VPN and firewall apps. Turn off any VPN service completely before attempting login. Some VPNs specifically interfere with MLBB's auth endpoints.
Step 6: Update the app. Open your device's app store and check for MLBB updates. Install any available update, then try logging in.
Step 7: Relink your account. In MLBB Settings, unlink and relink your Facebook or Google account. This refreshes the authentication token and often resolves persistent login errors.
Step 8: Contact Moonton support. If none of the above works, file a support request at support.mobilelegends.com. Include your UID (if you know it), device model, OS version, and a description of the exact error message.
FAQ
Will a login error delete my account or progress? No. Account data is stored server-side. A login failure doesn't affect your heroes, rank, or diamond balance.
Does restarting the phone help? Yes, often. A device restart clears system-level caches and resets network connections, which frequently resolves auth errors that clearing the app cache alone doesn't fix.
What if the error only happens when logging in with Facebook? Try logging in with an alternative method (Google or Moonton ID) if one is linked to your account. If another method works, the issue is specific to the Facebook API integration — report it to Moonton.
Once you're back in, keep your diamond balance ready for every session. Top up MLBB on Marix — fast, straightforward, and available when you need it.