Launch events not triggering when Outlook add-in is installed from App Source

Jordi Salvat i Alabart 0 Reputation points


We developped an add-in for Outlook. It uses OnMessageRecipientsChanged and OnMessageSend LaunchEvents. It was difficult, but eventually we got both events to trigger and operate correctly when installed via sideloading (using, even on Outlook Classic. We submitted it to Microsoft Marketplace via Partner Center, so it is currently published here:

But now, when we install our add-in from App Source (by opening Outlook, clicking "Apps" > "Add apps" > searching for "Mixmax" > "Add"), the launch events don't trigger.

Any hints at what might be going on?

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