I have an Excel 2013 Add-in.
I can't figure out why it won't load through Remote Desktop gateway if the user haven't first logged in through a normal RDP connection.
When looking into the registry on the server it seems office is missing some entries that used to be there such as: CURRENT_USER\Software\Microsoft\Office\Excel\Addins\
I only got CURRENT_USER\Software\Microsoft\Office\15.0\Excel\