PowerPoint error, 'PEPPTAddin not trusted'

This page is in reference to this PowerPoint error: System.Security.SecurityException: Customized functionality in this application will not work because the certificate used to sign the deployment manifest for PEPPTAddin or its location is not trusted. Contact your administrator for further assistance.

Most likely, this is caused by the computer’s account settings or Trusted Publisher certificate settings.

Solution 1: Install Poll Everywhere MSI “For Everybody”

  1. Follow instructions on “Installing for Everybody”

Solution 2: Disable certificate requirement

  1. Open up Powerpoint Options

  2. Go to the section labelled Trust Center

  3. Click on Trust Center Settings. This will open a new window.

  4. In the new Trust Center Settings window go to Add-ins

  5. Disable ‘Require application add-ins to be signed by a trusted publisher’

  6. Learn more about specifying trusted sources from this Microsoft arcticle

Trust Center

Solution 3: Create a trusted publisher certificate

Follow the steps from Microsoft on how to add, remove, or view a trusted publisher.

Solution 4: Configure the ClickOne trust prompt behavior

Follow the Microsoft steps on how to configure the ClickOne trust prompt behavior.

If you continue to have trouble please gather your logs and contact support.


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