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Outlook for iPhone IOS 14 S/MIME Certificate untrusted

Anonymous
2021-03-24T15:13:22+00:00

I have a certificate from Digicert installed in outlook for iphone. When I attempt to enable signed or encrypted emails I get this error message:

"You can't do this right now

There's a problem with one of your S/MIME signing certificates. Contact your IT help desk for more info."

When I examine the certificate details in Outlook I see that it is untrusted. I have installed the Root and Intermediate CA profiles to the phone and set them to be trusted.

I have examined the certificate and I believe it meets the security requirements.

This same certificate works fine with Outlook for Mac.

Any assistance to get this functional would be greatly appreciated.

Outlook | Outlook for mobile | Outlook for iOS | For business

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  1. Anonymous
    2021-05-13T18:55:31+00:00

    I have this same problem. Sectigo or Actalis s/mime certs.  All work on Office15, Office16, O365, Outlook for Mac, and other mobile apps like 9folders. Also does the iphone IoS version support ldap address books like desktop Outlook does? Our intl setup relies on userSMIMECertificate AD attribute since it scales better than GAL.  Thank you.

    5 people found this answer helpful.
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  2. Anonymous
    2021-03-24T19:59:00+00:00

    Thanks Ivania. I do understand how to deploy S/MIME. The problem I think I’m having is that Outlook for IOS doesn’t trust the certificate. This is new behavior since I had to upgrade to IOS 14. It was working previously.

    2 people found this answer helpful.
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  3. Anonymous
    2021-03-26T14:55:19+00:00

    If I try to import .SST on Outlook for IOS is says it is an unsupported file type. This also does not solve the problem.

    1 person found this answer helpful.
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  4. Anonymous
    2021-03-24T21:31:23+00:00

    Thank you for your feedback Aaron!

    Please check this forum that will solve this problem and the user has found the solution:

    https://answers.microsoft.com/en-us/msoffice/fo...? auth = 1

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  5. Anonymous
    2021-03-24T18:29:54+00:00

    Hi Aaron, I´m Ivania. I´m an Independent Advisor and a Microsoft user like you. I´ll be glad to help you today.

    Good afternoon!

    Conducting a research on the subject I believe that these two articles can guide you to deploy S / MIME certificates with Outlook for iOS.

    To use S / MIME with Outlook for iOS, the user's mailbox must be on Exchange Online.

    Articles:

    01:

    https://techcommunity.microsoft.com/t5/intune-c...

    02:

    https://docs.microsoft.com/exchange/clients-and... deploying-smime-certificates-with-outlook-for-ios-and-android

    I hope I have been useful!

    Ivania

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