Hkey_current_user\software\microsoft\office\16.0\common\identity Free Link

| Value Name | Type | Example | Description | |------------|------|---------|-------------| | LastLoggedInUser | REG_SZ | user@contoso.com | Email address of the most recently signed-in user. | | DisableADALatopWAMOverride | REG_DWORD | 0 or 1 | Disables Web Account Manager (WAM) for AAD auth (used in troubleshooting). | | EnableADAL | REG_DWORD | 1 | Enables Modern Authentication (ADAL). Set to 0 to force Basic Auth. | | Version | REG_DWORD | 1 | Schema version of identity storage. | | ConfigFlags | REG_DWORD | 0 | Bitmask for various identity behavioral settings. |

If the above does not work, or the password box does not pop up, you might need to force legacy authentication:

For the vast majority of users, this key exists in a state of blissful obscurity, doing its job without complaint. | Value Name | Type | Example |

Administrators can control identity behavior via for Office. Relevant policies:

While it suffers from opacity and a tendency to "cache" errors aggressively, its role is indispensable. It succeeds brilliantly when invisible and fails spectacularly when broken. Set to 0 to force Basic Auth

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At its core, the Identity key represents Microsoft’s shift from the old Device Registration model to the modern Azure AD (Entra ID) join paradigm. It replaces the reliance on ADAL (Active Directory Authentication Library) with the more robust WAM (Web Account Manager), although legacy keys often persist here like digital fossils. | If the above does not work, or

In addition to the registry, clear the Windows Credentials Manager ( Control Panel\User Accounts\Credential Manager ) for any cached MicrosoftOffice16 credentials.