Outlook 365 Can No Longer Encrypt Emails

Michael Adams 306 Reputation points
2021-10-27T19:33:05.187+00:00

I have worked with Microsoft Office 365 support, and they have not come up with a solutions to this problem. Outlook 365 was able to encrypt emails in the past, but can no longer do so. This issue has affected both computers in the office. If I use the web version, it works fine. So it is not a licensing problem.

Anyone have any ideas on how to get this back working?

Thanks!

Outlook Management
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
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Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. KyleXu-MSFT 26,211 Reputation points
    2021-10-28T01:52:38.727+00:00

    @Michael Adams

    Do you use Exchange online? If so, use command below to check whether the certificate published to GAL: 

    Get-Mailbox <user> | FL or FT *user*

    If certificate isn't published, you need to publish it with step below(You need to install user certificate to local computer first):
    144325-qa-kyle-09-47-55.png

    For more detailed information, you can have a look about this article: How to Configure S/MIME in Office 365

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