I already tried asking this in the Microsoft Dynamics forum.
I have deployed the App for Outlook. I have added three custom tables (entities). These now show up in Quick Create and the Regarding lookup.
I have also removed the Contact, Lead, and Account tables. But when I click the Add button, the three options are "Add as Contact" and so on.
When I click on an email that is already saved in Dynamics 365 Sales Enterprise, the Recipient Picker says "Unknown Recipient" (see image below). How can I get the Recipient picker to include the custom tables that I've added?
I've tried refreshing the app, redeploying, and running the App for Outlook checker.
App for Outlook is using Exchange server-side synchronization.
Thanks, Shane.
As far as I know and I read, you cannot set custom entity for Recepient. It can only be Account, contact or lead. But you can set Regarding for custom entity and track email communication.