2013 – Synchronizing Outlook Calendar Categories with a Sharepoint calendar using email address assigned to SP calendar

I have a SharePoint calendar configured with an incoming email and want to populate events with categories in the SharePoint calendar by sending events from Outlook to SharePoint. I have the same categories in Outlook and in the SharePoint calendar.

When I enter in Outlook an event with a category directly in the SharePoint calendar connected to Outlook, then the category is correctly updated in the calendar on SharePoint.
However, when I create an event with the same category in Outlook using my Outlook Exchange Account and send the event to the SharePoint calendar’s incoming email address, then the event in SharePoint does not contain the category.

Has anyone been able to get this to work or has suggestions for workarounds using the incoming email feature?

We are using Outlook 2013 and Sharepoint 2013.