Error Something went wrong [4qm45] when trying to Sign in

The combination of “stored credentials are out of date” and “Something went wrong [4qm45]” usually indicates that the cached Microsoft 365 sign-in credentials need to be refreshed.

I would try the following in this order:

1. Close all Microsoft 365 applications such as Word, Excel, Outlook and Teams.

Open Windows Settings → Accounts → Access work or school and check whether the affected work/school account is listed. If it is disconnected or showing an error, reconnect it.

Open Credential Manager:

Search for Credential Manager from the Start menu.

  Select Windows Credentials.
  
     Remove Microsoft 365/Office-related cached credentials (for example entries containing `MicrosoftOffice`, `ADAL`, or `OneAuth`).
     
        Restart the computer.
        

1. Open Word again and try Sign in.

If the problem persists, run the Microsoft 365 Sign-in troubleshooter through the Microsoft Support and Recovery Assistant (SaRA). This can detect authentication and Office account problems that are not always visible in the Office UI.

Also make sure that Windows date/time are correct and that the device has normal internet access. Authentication can fail if the system clock is significantly out of sync.

If this is a work or school account, the Microsoft Entra ID sign-in may also be affected by Conditional Access, MFA, device registration, or an account/license issue. In that case, the Microsoft 365 administrator should check the user's sign-in logs.

Since the error includes a Correlation ID and timestamp, I would keep those details when contacting the administrator or Microsoft Support. They can be useful for tracing the failed authentication attempt.

I would avoid repeatedly deleting random Office folders or reinstalling Office until the cached credentials and account connection have been checked first.

Dear @Hadjedz Jordan (ext),

Please understand that this forum is a public platform, and moderators will modify your question to cover your personal information in the description. Please notice to hide these personal or organization information next time you post error or some information to protect personal data. 
Based on your description, this behavior is commonly associated with corrupted or stale authentication data stored locally. Cached Office identities, Windows Credential Manager entries, or Windows account tokens can prevent Office from completing modern authentication.

To better understand your situation, could you please provide some more information as:

1. Can the you sign in successfully at https://m365.cloud.microsoft/?
2. Under File > Account in Word, does it show Product Activated, Activation Required, or Unlicensed Product?
3. Whether the issue affects a single user or multiple users?

In the meantime, here are some suggestions you can try:

1/Clear Office identity cache

• Ensure all Office applications are closed.
• Browse to the following locations:

%localappdata%\Microsoft\OneAuth
%localappdata%\Microsoft\IdentityCache

• Rename the folders or remove their contents.
• Launch Word and attempt to sign in again.

2/Perform an Online Repair of Microsoft 365 Apps

• Open Control Panel > Programs and Features.
• Select Microsoft 365 Apps.
• Choose Change.
• Select Online Repair.
• After the repair completes, restart the device and test sign-in.

Additionally, please refer to the solution shared by Muhammad Bilal Khan, which recommends removing cached Office credentials and verifying the Work or School account registration.

For reference

Issues signing into Microsoft 365 Apps

Error 0x8004dec5 when signing in to OneDrive

I hope information above can help you resolve the issue, if not, please provide more information as my previous questions so I can support you more effectively.

Looking forward to your update.

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