How to Fix Microsoft 365 Account Login Stuck on Loading

If Microsoft 365 account login fails—especially when switching accounts stalls on an endless Loading screen—the apps may be holding cached authentication tokens for an old or expired identity. Confirm the correct account context first, clear the corrupt license or credential state with Microsoft’s supported removal tool on Mac, then sign in again with the office or school account you need.

What Happens When You Cannot Log In to a Microsoft 365 Account

Log in to Microsoft 365 Account prevents Microsoft 365 from working as expected. The failure affects sign-in and login flows and stops the expected operation from completing—commonly as a Loading loop while you try to leave an old account and enter a new one.

Quick Answer for a Microsoft 365 Login Loading Loop

On Mac, download and run the official Microsoft Office License Removal Tool, complete the installer prompts, then reopen Microsoft 365 apps and sign in with the correct work or school account. Before that, confirm you are using the intended account type and that you are not stuck validating an expired personal or former organization identity. If the account remains inaccessible after a clean credential reset, escalate to your administrator or Microsoft support for identity or MFA issues.

Possible Causes of Microsoft 365 Sign-In and Login Problems

• Windows or Mac apps may cache authentication tokens for an old, expired, or inaccessible account.

• Switching accounts can loop when the app keeps validating an identity that no longer exists or that you cannot access.

• Saved credentials or license state may not match the work or school account you want to use.

• Security information, MFA, or organization policy may block completion after the local cache is cleared.

• Signing into the wrong personal versus work account can look like an app hang rather than a clear error.

Recommended Solution: Clear Corrupt Account State With the Office License Removal Tool on Mac

When login is stuck on Loading while switching accounts, clearing corrupt license and credential state is usually faster than repeatedly signing out inside the looping UI.

1. Fully quit Word, Excel, PowerPoint, Outlook, and other Microsoft 365 apps.

2. Download the official Microsoft Office License Removal Tool from Microsoft’s support resources for Mac.

3. Open the downloaded .pkg file from your Mac Downloads folder and run the installer.

4. Follow the prompts and click Install. When it finishes, close the tool.

5. Restart the Mac if prompted, then reopen a Microsoft 365 app.

6. Sign in with the correct office or school account—not the expired account that was stuck in the Loading loop.

7. If sign-in still fails, confirm MFA methods for that account, try a private browser sign-in to the Microsoft 365 portal, and contact your admin if the organization blocks the account.

This works because the Loading loop often comes from cached tokens for an identity the app can no longer validate. The license removal tool clears that local state so a fresh work or school sign-in can proceed.

Additional Solution: Confirm Account Context Before Escalating

Use these checks when the tool completes but the portal or apps still reject the login.

1. Verify whether you should use a personal Microsoft account or a work/school account for this subscription.

2. Sign out of browser sessions for account.microsoft.com / office.com, then sign in only with the target account.

3. Ask an administrator whether the mailbox or Microsoft 365 license is still assigned if this is an organization account.

4. Escalate to Microsoft support only after local credential reset and admin checks, so identity or security-info problems are not mixed up with a simple cache loop.

Keep Editing Files With WPS Office During a Microsoft 365 Login Outage

WPS Office cannot reset Microsoft account passwords, clear Microsoft license tokens, or complete Microsoft 365 sign-in for you. While login is blocked, you can still work on local copies of your documents in WPS.

1. Install WPS Office on your computer.

2. Open local .docx, .xlsx, .pptx, or PDF files in the matching WPS app.

3. Save changes to a clearly named local folder until Microsoft 365 sign-in works again.

4. After you regain Microsoft access, upload or reopen files in Microsoft 365 only if you still need cloud features.

Expected result: document work continues offline. Limitation: WPS does not fix Microsoft login, MFA, or organization account policies.

Try WPS Office if you need a free compatible suite while Microsoft 365 account access is being restored.

Prevention Tips for Microsoft 365 Login Problems

• Finish signing out of an old account before adding a new work or school account when possible.

• Keep at least one alternate MFA method registered for important accounts.

• Avoid storing multiple stale Microsoft identities on a shared Mac profile.

• After organization offboarding, remove old Office licenses with the supported tool instead of only closing the app window.

FAQs About Logging In to a Microsoft 365 Account

Why does Microsoft 365 stay on Loading when I switch accounts?
The app may be validating cached tokens for an expired or inaccessible account instead of completing a clean sign-out.

Is the License Removal Tool safe?
It is Microsoft’s supported way on Mac to clear corrupt license state. You will need to sign in again afterward with the correct account.

Can WPS Office log me into Microsoft 365?
No. WPS cannot fix Microsoft sign-in or activation; it only helps with local office files meanwhile.