How to Fix Office 2016 Sign-In to a Personal Microsoft Account

Explain that this issue falls strictly under the category of Microsoft 365 and Office | Install, redeem, activate | For home | Windows . Note that the appearance of the Windows PIN prompt exclusively on personal accounts is a strong indicator of corrupted local identity caches rather than an actual account ban or password error

Diagnosing the Account Error Loop

The first practical checkpoint is not a generic restart; it is this exact action: Press Windows + R to open the Run dialog box

Clearing the Identity Cache and Registry

The steps below target Office 2016 Sign-In to a Personal Microsoft Account and use Left navigation pane at HKEYCURRENTUSER\SOFTWARE\Microsoft\Office\16.0\Common\Identity as the visible reference point.

1. Press Windows + R to open the Run dialog box
2. Navigate to the local app data by pasting this exact path: %localappdata%/Microsoft/
3. Locate the folders named OneAuth and IdentityCache . Back up these folders to your desktop, then delete them from the Microsoft folder
4. Press Windows + R again, type regedit , and click OK to open the Registry Editor
5. Navigate the menu path to the exact registry subkey: HKEYCURRENTUSER\SOFTWARE\Microsoft\Office\16.0\Common\Identity
6. Right-click the Identity folder in the left pane and select Delete
7. Open any Office application (e.g., Word), navigate to File > Account , and attempt to log in again. Expected result: The prompt should accept the credentials without looping

How to Verify the Microsoft 365 Result

The workflow is complete only after this confirmation: Open any Office application (e.g., Word), navigate to File > Account , and attempt to log in again. Expected result: The prompt should accept the credentials without looping If the expected state is missing, revisit Right-click context menu on the 'Identity' folder in Left navigation pane at HKEYCURRENTUSER\SOFTWARE\Microsoft\Office\16.0\Common\Identity.

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For local work related to Office 2016 Sign-In to a Personal Microsoft Account, WPS Office is a free Microsoft Office-compatible alternative. It does not change Microsoft accounts, subscriptions, tenant roles, licenses, or cloud-service settings, so complete the Microsoft-side procedure above first.

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Microsoft 365 FAQs About Office 2016 Sign-In to a Personal Microsoft Account

What is the final validation for Fix Office 2016 Sign-In to a Personal Microsoft Account?

Complete this specific check: Open any Office application (e.g., Word), navigate to File > Account , and attempt to log in again. Expected result: The prompt should accept the credentials without looping It confirms the result in the same environment where the issue or task occurs.

What if my Microsoft 365 screen differs from the instructions?

First confirm this entry action: Press Windows + R to open the Run dialog box Then check whether you are using the desktop, web, mobile, or administrator interface named in the guide.

Why can another user get a different result for Fix Office 2016 Sign-In to a Personal Microsoft Account?

For Fix Office 2016 Sign-In to a Personal Microsoft Account, license level, tenant policy, ownership, and platform can change the available behavior. Test with the affected user’s own account rather than an unrelated administrator session.

How should I roll back a failed attempt at Fix Office 2016 Sign-In to a Personal Microsoft Account?

Restore the saved copy or return the recorded setting to its prior value. Avoid stacking additional changes until this expected outcome can be reproduced: Open any Office application (e.g., Word), navigate to File > Account , and attempt to log in again. Expected result: The prompt should accept the credentials without looping