How to Fix Roblox Error 901 (Authentication Error on Xbox)
What error 901 means
Error 901 is Roblox's authentication error — the message that appears when the login handshake between your device and Roblox's servers breaks down. The dialog usually reads something like "Authentication Error: Trouble communicating with Roblox servers. Please try again." and it blocks you from signing in at all, rather than failing when you join a game like some other Roblox codes do.
Although it can show up anywhere, error 901 is overwhelmingly an Xbox problem. On Xbox, your Roblox sign-in is tied to your Xbox profile and Gamertag, which adds extra moving parts to the login process. Players also report it on PC, and occasionally on mobile when the app is badly outdated. Roblox has never published an official page for this code, so what we know comes from years of player reports and Roblox's support team — the pattern is consistent: something in the account verification step is failing, and the fix depends on what that something is.
The most serious version of 901 is account moderation. If Roblox banned your account or moderated your Xbox Gamertag for breaking the community rules, the login fails and 901 is the message you see. But don't panic if you see it — 901 also shows up for entirely innocent reasons, like a server outage or a client that hasn't been updated in months. Run through the checks below in order before assuming the worst.
Common causes
- Account ban or moderated Gamertag: the most talked-about cause — if Roblox suspended your account or flagged your Xbox Gamertag for inappropriate content, authentication fails and 901 appears at login.
- Roblox servers are down or under maintenance: during outages or maintenance windows, login verification fails for everyone, and 901 is one of the errors that can surface.
- Outdated Roblox client: an old version of the app can't complete the current authentication process, which is why updating fixes the error for many players.
- Corrupted installation or cache: damaged local files or broken cached data on your Xbox or PC can corrupt the login handshake.
- Broken sign-in session or network glitch: a stale login token, a dropped connection during authentication, or router/DNS problems can make the server unable to verify who you are.
How to fix error 901 — step by step
Work through these fixes in order. Try signing in again after each step.
- Check Roblox's server status. Before changing anything, rule out a Roblox-side problem. Open status.roblox.com in your phone or computer browser and check Roblox's official social channels for outage or maintenance announcements. If the servers are down, nothing on your device will fix the login — wait 30–60 minutes and try signing in again. Skip the remaining steps until the servers are healthy.
- Check your account for a ban or moderated Gamertag. On a browser, try signing in at roblox.com. If the site tells you your account is banned or suspended, 901 on Xbox is just the symptom — you'll need to wait out the moderation period or appeal (see the FAQ below). On Xbox, also check your Gamertag: Roblox can moderate names that contain inappropriate words, and a moderated Gamertag blocks Roblox authentication entirely. If your Gamertag is questionable, change it on your Xbox profile (Settings > Profile & system > Choose a new Gamertag), then try signing in to Roblox again.
- Unlink and sign back in. A stale or broken login session is a common non-ban cause of 901. On Xbox, sign out of your Roblox account in the app's settings, then sign back in with your username and password. Also sign out and back in on any other device where you use the same account — a conflicting session on another device can interfere with authentication. This single step clears the error surprisingly often.
- Update or reinstall Roblox. An outdated client is one of the simplest causes. On Xbox, open the Microsoft Store, go to My games & apps, and check for updates for Roblox. On PC or mobile, update through the official store. If 901 still appears after updating, uninstall Roblox completely, restart your device, and download a fresh copy from the official store. A clean install removes corrupted files that the update process leaves behind. Your account, games, and items are safe — they're tied to your account, not the app.
- Restart your device and network. On Xbox, hold the power button for about 10 seconds until it fully shuts down, unplug the console for 30 seconds, then plug it back in and restart — this clears the system cache. On PC, restart your computer, then open Command Prompt as administrator and run
ipconfig /flushdnsto clear stale DNS entries that can break server communication. In both cases, also power-cycle your router: unplug it, wait 30 seconds, and plug it back in for a fresh, stable connection. - Try another platform, then contact Roblox Support. Try signing in to Roblox on PC, mobile, or a web browser. If you can sign in elsewhere, the problem is specific to your Xbox — double-check your Gamertag and the Xbox app installation. If error 901 follows your account to every device, the issue is on Roblox's end or your account is moderated. Submit a ticket through the official Roblox Support page with the exact error message, your username, your device model, and a list of every fix you already tried, and their team can check your account's authentication state directly.
Did this fix it? Quick checklist
- You can sign in to Roblox without the 901 "Authentication Error" dialog appearing
- Roblox's status page shows all servers as operational
- Your Xbox Gamertag doesn't contain anything that violates Roblox's naming rules
- The error doesn't follow your account to other devices
If error 901 keeps appearing after all six steps, try a completely different network (like a phone hotspot) to rule out router-level blocking, and avoid VPNs or proxies while signing in — Roblox can flag those and break authentication. As a last resort, give Roblox Support the full picture: the exact wording of the error, when it started, your username, and everything you've tried. Their staff can look at your account's login records, which is something no troubleshooting guide can do for you.
Frequently asked questions
What is Roblox error 901?
Error 901 is a Roblox authentication error that appears when you try to log in and Roblox cannot verify your account. The message usually reads “Authentication Error: Trouble communicating with Roblox servers. Please try again.” It is most common on Xbox, but PC players see it too.
Does Roblox error 901 mean my account is banned?
It can. Many players start seeing error 901 right after an account ban or after their Xbox Gamertag is moderated. But 901 also appears for non-ban reasons such as a server outage, an outdated client, or a broken login session — so check the server status and try the other fixes before assuming you're banned.
Why does error 901 mostly happen on Xbox?
On Xbox, your Roblox login is tied to your Xbox profile and Gamertag, so Gamertag moderation or a sign-in mismatch between Xbox and Roblox blocks authentication at the login step. On PC and mobile you sign in directly with your Roblox credentials, which is why the error is rarer there.
Will reinstalling Roblox delete my games or items?
No. Your games, items, friends, and purchases are tied to your Roblox account, not to the app on your device. Reinstalling Roblox only removes local files and downloaded data — everything reappears when you sign back in.
How do I appeal a Roblox moderation linked to error 901?
Use the official Roblox Support page to submit an appeal. Describe the error 901 message, explain that you believe the moderation was a mistake, and include your username and device. If the ban was temporary, waiting out the moderation period also works — most minor bans lift on their own.