If your Microsoft account gets temporarily locked because of unusual activity, multiple failed login attempts, or a suspected security breach. It might happen that Microsoft can block your account temporarily to protect your data. It may irritate if your account is used for actual services like Outlook, OneDrive, Skype, or Xbox. If you facing the same problem, then you can go with some easy steps to recover your locked Microsoft account and regain control.
The user should check the reason for getting the account locked before moving to recovery options
Unusual sign-in activity- If Microsoft detects login attempts from different locations or unfamiliar devices, it may lock the account as a precaution.
Suspicious behaviour- Sending a large number of emails by the user in a short time or uploading suspicious files can trigger a lock.
Multiple failed login attempts- Entering the wrong password too many times may result in a temporary lock.
Now, let’s look at how to recover Locked Microsoft Account.
Step 1: Visit the Account Recovery Page
The user should go to the home page and try to log in again with the correct ID and password if they are unable to do then visit the official recovery page: https://account.live.com/acsr. This page allows you to verify your identity and start unlocking your account.
Step 2: Enter Your Locked Account Email
If you enter the email address of the Microsoft account that has been locked. You may also be asked to provide an alternative email where Microsoft can send a communication recovery message or OTP regarding the recovery process.
Step 3: Fill in Account Details
There will be an option that Microsoft may ask to provide some personal details to verify your identity. These may include:
If you can provide an accurate and specific answer, then it can increase the chance to recover your account.
Step 4: Check Your Alternate Email
After submitting recovery form with personal detail you should check your alternate email id where Microsoft will send a verification code to your alternate email address. There will be an OTP so Enter this code when prompted to verify that you have access to this contact method.
Step 5: Reset Your Password
If the recovery information you provide matches on file, then Microsoft will send you a link to reset your password. Choose a strong password that is different from your previous ones to ensure better security.
Step 6: Wait It Out (If the account is Temporarily Locked)
It is possible that your Microsoft account may be temporarily locked because of multiple incorrect login attempts. In such cases, users are advised to wait 24 hours before attempting to log in again can solve the issue. Meanwhile, you should check your devices for malware and change passwords for other linked services.
When you experience a Microsoft Office 365 not login problem, it can disrupt productivity, email access, and file synchronization across all your devices. Many users face this issue due to incorrect credentials, expired passwords, outdated Office apps, or network restrictions. Fortunately, the problem can be fixed through a series of structured troubleshooting steps — from verifying account details to resetting your credentials or repairing the Office installation.
This detailed guide explains all possible causes and solutions for the Microsoft Office 365 not login error. You’ll also learn how to handle it on Windows, macOS, and mobile devices while keeping your Microsoft account secure and accessible.
Microsoft Office 365 integrates multiple services like Word, Excel, Outlook, OneDrive, and Teams under one unified account. When you log in, your device communicates with Microsoft’s authentication servers using your Microsoft credentials.
If your Office 365 not login issue appears, it usually means this communication has been interrupted or your credentials were not validated properly. Common factors include:
Wrong username or password.
Expired credentials or inactive subscription.
Network connectivity errors.
Two-step verification or MFA (multi-factor authentication) issues.
Corrupt cache or outdated app versions.
Once you identify which of these applies to you, fixing the Microsoft Office 365 not login issue becomes much easier.
A stable internet connection is essential for Microsoft authentication. If your network is slow, unstable, or blocked by a firewall, you might not be able to log in.
Try these fixes:
Restart your router or modem.
Switch to a different Wi-Fi network or use a mobile hotspot.
Disable any VPN or proxy settings temporarily.
Run Windows Network Troubleshooter (Settings → Network & Internet → Troubleshoot).
Once your connection is stable, attempt your Microsoft Office 365 login again.
Before attempting technical fixes, ensure you’re using the correct Microsoft 365 credentials. Many users have multiple accounts — work, school, or personal — leading to confusion.
To verify:
Try logging in directly.
If you can access your dashboard, your credentials are valid.
If not, use the Forgot Password link to reset it.
After resetting your password, re-enter it carefully in the Office 365 app or Outlook to fix the Microsoft Office 365 not login issue.
Sometimes, saved authentication tokens in Windows Credential Manager or macOS Keychain become corrupted. This prevents Office apps from validating your login.
Press Windows + R, type control keymgr.dll, and hit Enter.
Under Windows Credentials, find any entries related to MicrosoftOffice16_Data:ADAL or MicrosoftOffice15_Data:ADAL.
Delete them.
Restart your system and try logging into Office 365 again.
Open Keychain Access.
Search for “MicrosoftOffice” and delete related entries.
Restart your device.
Clearing cached credentials often resolves the Microsoft Office 365 not login loop instantly.
An outdated version of Office can also prevent successful sign-in due to expired authentication protocols or compatibility issues.
To update:
Open any Office app (e.g., Word or Excel).
Go to File → Account → Update Options → Update Now.
Wait until updates are installed, then restart the app.
If you use macOS, go to the Help menu → Check for Updates in Microsoft AutoUpdate.
Keeping your Office apps current ensures secure sign-ins and may fix Microsoft Office 365 not login problems instantly.
A corrupted Office installation can interrupt the authentication process. Fortunately, Windows provides an easy way to repair it.
Open Control Panel → Programs → Programs and Features.
Select Microsoft 365 Apps and click Change.
Choose Quick Repair first — if that doesn’t work, select Online Repair.
Restart your PC and try logging in again.
You’ll need to uninstall and reinstall the Office suite:
Drag Office apps to the Trash.
Reinstall them from https://www.office.com.
Repairing restores essential login components, resolving most Microsoft Office 365 not login cases.
Sometimes, the issue occurs not because of a technical error but due to an expired Office 365 subscription.
To verify your license status:
Log in to https://account.microsoft.com/services.
Check the Microsoft 365 section.
Ensure your subscription is active and properly assigned.
If you’re part of a work or school account, contact your IT administrator to confirm that your license hasn’t been revoked.
Renewing your subscription will immediately fix any Office 365 not login issue related to account inactivity.
Overprotective firewall or antivirus programs sometimes block Microsoft authentication servers.
To test this:
Temporarily disable your antivirus or firewall.
Attempt to sign in again.
If successful, add the following Microsoft URLs to your firewall whitelist:
login.microsoftonline.com
office.com
outlook.office365.com
graph.microsoft.com
Once done, re-enable your protection software to maintain system security.
If you’ve recently changed your password or enabled two-step verification, some devices may still hold old credentials.
To fix the Microsoft Office 365 not login issue:
Select Sign me out everywhere.
Re-sign in with the updated password on all devices.
This resets all login sessions, ensuring your Office 365 syncs properly.
Many organizations require Multi-Factor Authentication (MFA) for Office 365. If your phone number or Authenticator app is not configured correctly, login attempts may fail.
To resolve this:
Ensure your authentication method (Authenticator App, SMS, or Email) is up to date.
Remove old or inactive devices.
Try signing in again.
Proper MFA configuration is critical to avoiding Microsoft Office 365 not login errors in corporate environments.
If none of the above steps work, you can reset Office sign-in data manually.
For Windows:
Open Registry Editor (regedit).
Navigate to:
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity
Delete the entire Identity folder.
Restart your computer and re-login.
This method forces Office to create new authentication tokens, fixing any Office 365 not login configuration errors.
Sometimes, the Microsoft Office 365 not login error occurs only in Outlook or OneDrive, not the entire suite.
For Outlook:
Go to File → Account Settings → Account Settings.
Remove your email account and re-add it using your Microsoft 365 credentials.
If Outlook keeps asking for a password, clear cached credentials in Windows.
For OneDrive:
Right-click the OneDrive icon → Settings → Account → Unlink this PC.
Sign in again using your Microsoft 365 account.
These steps re-establish secure connections to Microsoft’s servers.
If you’re facing Microsoft Office 365 not login problems on mobile:
Open Settings → Apps → Office (or Outlook).
Tap Storage → Clear Cache and Clear Data.
Reopen the app and log in again.
Go to Settings → General → iPhone Storage → Office.
Tap Offload App, then reinstall it.
Open the app and re-enter your Microsoft credentials.
Clearing cached data refreshes your mobile authentication tokens, fixing mobile login failures.
Microsoft provides an automated tool — Support and Recovery Assistant (SaRA) — designed specifically to diagnose and fix login and connectivity problems in Office 365.
How to use it:
Download SaRA from Microsoft’s official site.
Run the tool and select the problem area (e.g., Outlook login issue).
Follow the guided steps.
SaRA automatically detects configuration problems and repairs them, resolving the Microsoft Office 365 not login issue without manual intervention.
If all troubleshooting steps fail, your issue might be related to server-side or account-level problems.
You can contact Microsoft Support through:
Phone support via Microsoft’s regional help numbers.
Live chat through your Office 365 admin portal.
Provide details like:
Device and OS version.
Error message screenshots.
Steps already tried.
This helps support agents quickly identify and resolve your Microsoft Office 365 not login issue.
To prevent future login problems:
Keep Office apps updated regularly.
Change passwords every few months.
Clear cached credentials when switching accounts.
Avoid using unsecured public Wi-Fi for sign-ins.
Ensure MFA methods are current and verified.
These proactive steps reduce authentication failures and keep your Microsoft Office 365 login process smooth.
Fixing the Microsoft Office 365 not login issue may seem daunting, but most problems stem from simple causes like network issues, outdated apps, or cached credentials. By systematically verifying your connection, credentials, and Office configuration, you can regain access to your account quickly.
Whether you’re on Windows, macOS, Android, or iOS, these methods work universally to restore functionality. And if your issue persists, Microsoft Support and Recovery Assistant provides a guided way to resolve deeper technical problems.
Stay updated, keep your authentication data clean, and ensure your account details are correct — and you’ll rarely face the Microsoft Office 365 not login error again.