We have identified the issue as being an error on Microsoft's end. For now, it seems that some users are able to load add-ins in Outlook on the web, and others are not. We suspect this is due to a rolling deployment of a fix on Microsoft's end. For now, we are monitoring the situation.
Posted Mar 17, 2020 - 16:32 CET
Update
We are continuing to investigate this issue.
Posted Mar 17, 2020 - 16:08 CET
Investigating
We are currently investigating this issue.
Posted Mar 17, 2020 - 16:00 CET
This incident affected: Meeting+ (Europe) (Meeting+ Add-in), Visitor Management (North America) (Welcome+ Add-in), Meeting+ (North America) (Meeting+ Add-in), Visitor Management (Europe) (Welcome+ Add-in), RoomFinder (Europe) (RoomFinder Add-in), and RoomFinder (North America) (RoomFinder Add-in).