Outlook 2016 / 2021 Pro keeps asking for Password E1 Licenses

VFS@BID 0 Reputation points
2023-03-10T14:15:17.0433333+00:00

Starting yesterday, desktop versions of Office Professional 2016 and 2021 keep prompting for password. The Windows Security window will not go away even with checking to remember password. A call to MS support said it was because the user was not the person Office was registered to due to modern authentication. Regedit to force Outlook to use MO did not work. This does not make sense. A fully licensed copy of Office installed on a single workstation is able to be used by multiple domain users. We have 3 shifts 7 days a week with multiple users sharing a workstation. Email box is fully functional on webmail. While email is not down, this is very inconvenient for users who access multiple email boxes.

Microsoft Exchange Online
Office
Office
A suite of Microsoft productivity software that supports common business tasks, including word processing, email, presentations, and data management and analysis.
1,295 questions
Windows 10 Security
Windows 10 Security
Windows 10: A Microsoft operating system that runs on personal computers and tablets.Security: The precautions taken to guard against crime, attack, sabotage, espionage, or another threat.
2,751 questions
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8 answers

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  1. Amit Singh 4,846 Reputation points
    2023-03-13T07:14:00.7133333+00:00

    You can disable this check for an on-premise Exchange Server. Go to the registry key HKEY_CURRENT_USER\Software \Microsoft\Office\16.0\Outlook\AutoDiscover and create a new DWORD parameter named ExcludeExplicitO365Endpoint and value 1. Restart Outlook.e

    You can make changes to the registry with the following command:

    reg add HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Outlook\AutoDiscover /t REG_DWORD /v ExcludeExplicitO365Endpoint /d 1

    Or, using the PowerShell cmdlet Set-ItemProperty:

    Set-ItemProperty -Path "HKCU:\Software\Microsoft\Office\16.0\Outlook\AutoDiscover" -Name 'ExcludeExplicitO365Endpoint' -Value 1 -Type DWORD –Force

    1 person found this answer helpful.
  2. Jame Xu-MSFT 4,166 Reputation points
    2023-03-13T08:24:24.5366667+00:00

    Hi @VFS@BID ,

    This issue can occur if the Logon network security setting on the Security tab of the Microsoft Exchange dialog box is set to a value other than Anonymous Authentication.

    Noting that you have contacted MS support, and considering the impact of modern authentication, you could refer to this: Outlook continually prompts for your password when you try to connect to Microsoft 365

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". 

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  3. Hani Roumieh 0 Reputation points
    2024-01-24T09:00:05.75+00:00

    I keep being prompted for entering my password. None of the proposed solutions is working. This is a huge concern. Unable to run MS Office 16 Outlook.

  4. Jeffrey CHROPKA 0 Reputation points
    2024-02-10T23:21:21.99+00:00

    I found A fix that worked for me, from this page:
    https://answers.microsoft.com/en-us/outlook_com/forum/all/microsoft-outlook-2016-pro-plus-keeps-asking-for-a/56d8e625-e6bf-44fd-8443-9fdfdc544bf9

    I followed this part....

    Sign out from Office applications. Open Run command prompt and type regedit->from Registry Editor, browse to the following location: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity and then delete complete Identity folder.

  5. Jeffrey CHROPKA 0 Reputation points
    2024-02-10T23:25:47.3666667+00:00

    I found A fix that worked for me, from this page:
    https://answers.microsoft.com/en-us/outlook_com/forum/all/microsoft-outlook-2016-pro-plus-keeps-asking-for-a/56d8e625-e6bf-44fd-8443-9fdfdc544bf9 I followed this part.... Sign out from Office applications. Open Run command prompt and type regedit->from Registry Editor, browse to the following location: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity and then delete complete Identity folder.