I noticed I am missing the Room Finger Button in the Ribbon Menu of the New Appointment Windows of Outlook 2016. I already read this article and checked what is set in my Registry: https://support.microsoft.com/en-us/help/2673231/how-to-control-the-room-finder-in-outlook
So, in my whole Registry there where no Key that says "RoomFinderShow" at all. So I created it like described in the "More Information" section of the Microsoft Support Page from above.
But that didn't do anything. Then I read a Post from a Microsoft TechNet Moderator called Perry_Pan: https://social.technet.microsoft.com/Forums/en-US/e3fa265a-948d-4e19-9fdc-cf1f5c08522f/room-finder-missing?forum=outlook
stating the Exchange Add-In would have to be active since the Room Finder would be a feature of this Add-In. So I activated it and restarted Outlook, but it did uncheck it in the Add-In Menu at the first start again. However, I still know that it's not the solution for my issue since I also have Outlook 2016 in a Citrix environment with the Exchange Add-In enabled and the Button is missing there, too.
After looking around a bit, I found the Room Finder Button in the "customize ribbon menu" setting. It's where it should be, but it's grayed out and I don't know why. (See the red marker on the Screenshot below.)
Also, when I add a Custom Ribbon Menu and add a second Room Finder Button to the custom menu, it's not grayed out (See the purple marker on the Screenshot above).
However, when I click on OK, the custom menu I created called "RoomFinder" shows, including the Room Finder Button, but here it's grayed out... (See Screenshot below: The Button should show up in the "Options" section, but it does not. It does show up in my custom menu, but it's still not useable.)
Another colleague, however, can use it just fine without doing anything for it.
Does anyone have any idea on why this feature is not working properly for me?