Windows may ask you to sign in again after an update, password change, account-security check or Windows Hello problem. A separate app, browser or work account can also display a prompt that looks like Windows. Before typing a password, identify exactly where the message appears and which account it names.
Confirm that the prompt is really from Windows
A genuine Windows sign-in screen appears at startup, wake or lock and normally shows an account already configured on the PC. A prompt inside a browser tab, email or pop-up window may belong to a website instead. Close unexpected prompts and open Settings directly from the Start menu.
Do not call a number in a warning, approve an unexpected authenticator request or share a one-time code. Microsoft support does not need your password to diagnose an ordinary sign-in loop.
Finish updates and restart once
Open Settings, Windows Update and install pending updates from Microsoft. Choose Restart rather than Shut down so Windows can complete queued work. Microsoft’s sign-in troubleshooting guidance notes that restarting can clear temporary errors and recommends Update and restart when updates are available.
After the restart, sign in once and wait a minute before opening apps. If the request returns, write down its exact wording and whether it appears before or after the desktop loads.
Check the requested sign-in method
A PIN, fingerprint, face scan and Microsoft account password are different sign-in methods. Select Sign-in options on the lock screen and use a method you recognise. If Windows Hello fails, try the account password instead, then repair the PIN from Settings, Accounts, Sign-in options after reaching the desktop.
Reset a forgotten Microsoft account password only through Microsoft’s official account recovery pages. If a PIN must be reset, follow the Windows prompt rather than deleting security folders or using a registry script from an unknown site.
Review work or school accounts
Open Settings, Accounts, Access work or school. A company or school account may require reauthentication after its password changes or its organisation updates a security policy. If the device is managed, contact the organisation’s IT team before disconnecting the account because removal can affect email, files, licenses and device access.
Also open Settings, Accounts, Email & accounts. Remove only stale accounts that you own and no longer use. Do not remove the Windows sign-in account just to stop a prompt.
Find out whether one app is responsible
If the desktop works but the request appears when opening Outlook, OneDrive, Microsoft Store, Xbox or another app, troubleshoot that app rather than the whole Windows profile. Sign out inside the affected app, restart it and sign back in through its normal account menu.
For browser prompts, verify the address bar. Clear cookies only for the affected official site if necessary; clearing everything signs you out elsewhere. If the issue is a repeating browser login, our sign-out checklist for ChatGPT illustrates how cookies and account security can create a different kind of login loop.
Check the clock, network and temporary profile warning
An incorrect date, time or time zone can interfere with secure sign-in tokens. Turn on automatic time in Settings, Time & language, then reconnect to a trusted network. On the lock screen, Microsoft also recommends checking the network connection when an online account cannot authenticate.
If Windows says “We can’t sign in to your account” or mentions a temporary profile, save any new files to external storage before signing out. Files created only in a temporary profile can be lost. Follow Microsoft’s specific temporary-profile recovery guidance instead of repeatedly changing passwords.
Use Safe Mode only for a persistent Windows-level problem
When no normal sign-in method works, Microsoft documents Safe Mode as a diagnostic option. PIN and biometric methods may be unavailable there, so you need the password for the local or Microsoft account. Safe Mode is not needed when only one app requests credentials.
Back up accessible files before advanced repairs. Avoid utilities that promise to bypass a password or “unlock” an account; they may damage the profile or steal credentials.
Official references
- Microsoft Support: Troubleshoot problems signing in to Windows
- Microsoft Support: Sign-in options in Windows
- Microsoft Support: “We can’t sign in to your account”
Reviewed: 3 October 2026. Menus can vary by Windows edition and organisation policy; use the options shown on your device and official Microsoft recovery channels.
