Information
This policy setting controls whether the specified Office application notifies users when unsigned application add-ins are loaded or silently disable such add-ins without notification. This policy setting only applies if the 'Require that application add-ins are signed by Trusted Publisher' policy setting is enabled, which prevents users from changing this policy setting.
If this policy setting is enabled, applications automatically disable unsigned add-ins without informing users.
If this policy setting is disabled, if this application is configured to require that all add-ins be signed by a trusted publisher, any unsigned add-ins the application loads will be disabled and the application will display the Trust Bar at the top of the active window. The Trust Bar contains a message that informs users about the unsigned add-in.
If this policy setting is not configured, the disable behavior applies, and in addition, users can configure this requirement themselves in the 'Add-ins' category of the Trust Center for the application.
Solution
Set the policy value for User Configuration >> Administrative Templates >> Microsoft Project 2016 >> Project Options >> Security >> Trust Center >> 'Disable Trust Bar Notification for unsigned application add-ins and block them' to 'Enabled'.