• Patch Lady – seeing Outlook authentication issues

    Posted on May 11, 2019 at 23:24 CDT by • Comment in the Forums

    On a private facebook group and on this thread in a Microsoft forum I’ve been seeing issues where Outlook via Office 365 is having issues authenticating.  I’m not quite sure of the trigger.  I don’t think it’s due to updates.  But the symptoms are that suddenly Outlook can’t authenticate and an error message that references a trusted platform module

    “”something went wrong” error that Trusted Platform Module has malfunctioned, error code 80090016.  The server message is “Keyset does not exist Keyset does not exist”

    There are a couple of ways around the issue.

    1. Build a new profile.  Icky but it works.
    2.  Enable multi factor authentication (which is wise to do anyway)
    3. Clear out the TPM chip cache (it appears some corruption is occurring which messes up the authentication)
    4. Or use this registry setting:

    Shut down Outlook and set the following registry key. (Disables modern authentication)
    HKCU\SOFTWARE\Microsoft\Office\16.0\Common\Identity\
    REG_DWORD
    EnableADAL
    0

    Office Patches/Security ,
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