GPO "Block Signing into Office" does not working anymore

Noc noc 1 Reputation point
2021-06-07T10:46:29.09+00:00

Hello,

we have our own on-premise exchange infrastructure and need to prevent using o365 accounts in Office / Outlook 2016.

Therefore we have configured the follow GPO "Block Signing into Office" with "None allowed". That had worked for the last times.

Since view weeks, it does not works anymore and every user can add a third-party O365 account to our Office suite.
The GPO are applied and the reg value are correct.

103025-image.png

Are there any known changes by MS in Windows, Office or GPOs that have changed the behavior?
What can I do, to block the O365 cloud features on my devices?

We are running Windows 10 Enterprise v1809 and Office 2016.

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A set of directory-based technologies included in Windows Server.
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14 answers

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  1. Vicky Wang 2,646 Reputation points
    2021-06-24T07:30:19.933+00:00

    Hi，
    You can wait quietly for the o365 team to contact you
    Thank you for your understanding and support
    Best wishes
    Vicky

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  2. Vicky Wang 2,646 Reputation points
    2021-06-29T09:42:07.89+00:00

    Hi,

    Welcome to share your current situation if there are any updates.

    Please feel free to let us know if you need further assistance.

    Best Regards,
    Vicky

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  3. Vicky Wang 2,646 Reputation points
    2021-07-02T07:45:27.627+00:00

    Hi,

    Welcome to share your current situation if there are any updates.

    Please feel free to let us know if you need further assistance.

    Best Regards,
    Vicky

    0 comments
  4. Alexander Stromer 1 Reputation point
    2022-11-03T03:24:23.907+00:00

    We have the same problem that the GPO "Block Signing into Office" (requires installation of Admin Templates btw: https://www.microsoft.com/en-us/download/confirmation.aspx?id=49030), which translates to the registry entry "signinoptions" seems to be ignored.

    Can someone from Microsoft do a proper investigation and response about this?
    This is a major data leak possibility (sign in to private and other corporate accounts), which is also not addressed through the "Tenant Restrictions" feature (which is about guest-account management and is not addressing actual other account sign-ins)

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