How to fix Microsoft not letting you log in

Follow these steps in order, testing sign-in again after each step:

1. Run the Microsoft sign-in helper
   • Go to the official Sign-in Helper: https://go.microsoft.com/fwlink/?linkid=2214157
   • Enter the email or phone used for the Microsoft account.
   • Follow the guided steps; it will detect common account issues and show what to do next.
2. Confirm the Microsoft account itself works
   • In a web browser, sign in directly to the Microsoft account (for example Outlook.com or account.microsoft.com) using the same email used in Modrinth.
   • If sign-in fails on the web:
     • If the password is forgotten, use Reset your password: https://support.microsoft.com/en-us/account-billing/reset-a-forgotten-microsoft-account-password-eff4f067-5042-c1a3-fe72-b04d60556c37
     • If the password is known but not accepted, use the Sign-in Helper tool again.
     • If verification codes are not received, follow the guidance in Troubleshoot Microsoft verification code issues.
3. Check for account blocks or verification issues
   • If messages like “Try another verification method” or repeated verification prompts appear, follow these steps:
     • Try a different verification method on the account (alternate email instead of SMS, or vice versa).
     • Try a different network (switch between Wi‑Fi and mobile hotspot, or another Wi‑Fi).
     • Wait at least 24 hours without repeated attempts if it looks like a temporary block, then try again.
     • If still blocked, run the sign-in helper again from: https://go.microsoft.com/fwlink/?linkid=2241206
4. Fix possible Error 400 / too many attempts
   • If an Error 400 or similar sign-in failure appears:
     • On the Microsoft sign-in page, choose Other ways to sign in and use a different method (Windows Hello, PIN, Authenticator app, or email code) if configured.
     • Try signing in from a different device (another PC or phone) and/or a different browser.
     • If using a Microsoft app for sign-in, reinstall or update that app.
5. Make sure Windows sign-in and network are healthy
   • Confirm Windows account sign-in on the PC works normally. If there are Windows sign-in issues (PIN, password, or Hello problems), fix those first using the Windows sign-in troubleshooting guides.
   • Restart the PC fully, then try Modrinth again.
6. Test Minecraft sign-in via the official launcher
   • Open the official Minecraft Launcher (from Microsoft Store or the standard installer).
   • Sign in there with the same Microsoft account.
   • If the account signs in and shows the Minecraft license correctly in the official launcher, close it and then try Modrinth again. (In similar cases, successfully signing in via the official launcher refreshed the account and fixed third‑party client sign-in.)
7. If the Microsoft account was recently blocked or changed
   • If the account was previously blocked due to unusual activity or many attempts, wait and then retry phone/email verification as described above; users have reported that retrying phone verification after some time finally delivered the code, allowing them to change the password and add more security methods.

If none of these steps resolve the issue and the Microsoft account works in a browser and in the official Minecraft launcher, the remaining problem is likely specific to the Modrinth client; in that case, reinstall Modrinth or contact Modrinth support while confirming that the Microsoft account itself is healthy using the steps above.

References:

• I can't sign in to my Microsoft account
• Troubleshoot Problems Signing In to Windows
• Troubleshoot Microsoft verification code issues
• Error 400 when signing in
• How to gain access to my Minecraft Account - Microsoft Q&A
• Linking Minecraft User to a Microsoft Account: Error-Drowned - Microsoft Q&A
• My Microsoft account is blocked. - Microsoft Q&A