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Extra O365 'Calendar' entry appeared for multiple users in tenancy

Possibly more of an O365 question, but posting here in case others are seeing similar.

I have an App that allows people to add entries to their calendars. It does this using Office365.GetEventsCalendarViewV2 and specifying the 'Name' (ID) of the Calendar with the display name 'Calendar'.


Sometime in the last couple of weeks (I'm just back to work after new year) multiple users have gained an extra Calendar entry with the display name 'Calendar' (as can be seen in the image above) which appears to be corrupt - attempting to reference the new 'Calendar' instance gives the error below:



The new, corrupt calendar is not visible in Outlook.

Curious to know what caused these new calendars to appear (affects multiple but not all users, so seems unlikely to be user action) and how to get rid of them.

As an emergency fix I'm going to try to set the App to test each calendar with the display name 'Calendar' until it finds one that works. 


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