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AhmedSHMK's avatar
AhmedSHMK
Copper Contributor
Jun 20, 2024

SMIME Extension Error in EDGE

I am getting an error while trying to test Out SMIME Extension in OWA (Outlook on the web)

 

-S/mime works fine in Outlook Desktop Client, Issue is only for OWA

 -I have installed the extension using the link:

Microsoft S/MIME - Microsoft Edge Addons

 

 

-Attempting to access S/mime page in OWA settings before installation(or while extension disabled) shows the attached:

-Link: https://outlook.office.com/mail/options/mail/smime

 

-After Installation(enabling), It just keeps loading forever, Never stops or returns the error

 

Accessing the Extension page: edge://extensions -> Select Extension -> Select "errors" shows the below:

 

Error while receiving settings: [object Object]

"Unchecked runtime.lastError: Access to the specified native messaging host is forbidden."

 

Any idea? What could be going wrong here? (Keep in mind, S/mime works fine in Outlook Desktop Client)

  •  
exchange online
office 365
SMIME

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  • HarperParker's avatar
    HarperParker
    Iron Contributor
    Apr 02, 2025

    1. Certificate Configuration Repair
    Clearing cached certificates
    powershell
    certmgr.msc → Remove all expired certificates from ‘Personal’ and ‘Trusted Publishers’.
    2. Re-register extensions
    powershell
    reg add ‘HKLM\Software\Policies\Microsoft\Edge\Extensions\ghbmnnjooekpmoecnnnilnnbdlolhkhi’ /v installation_mode /t REG_SZ /d force_ installed /f installed /f
    3. Group Policy Configuration
    Force enable S/MIME
    xml
    <Policy>
      <ExtensionInstallForcelist>
        <Item>
          <Id>ghbmnnjooekpmoecnnnnilnnbdlolhkhi</Id>
       <UpdateUrl>https://edge.microsoft.com/extensionwebstorebase/v1/crx</UpdateUrl>
        </Item
      </ExtensionInstallForcelist
    </Policy>
    Run the HTML
    4. Certificate auto-selection rules
    powershellSet-SmimeConfig -OWACertificateIssuingCA ‘CN=YourCA, DC=domain, DC=com’

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