Automatic Calendar Event Updates/Cancellations in Microsoft 365

[janakkhadka]

Hi,

One of our customers is experiencing an issue with Microsoft 365 where automatic calendar event updates and cancellations are being sent from one of the user accounts. The user has confirmed that they did not initiate these actions.

Here are the details:

• The issue is occurring with a single user account till this time.
• The automatic updates and cancellations are being sent to all attendees of the few random events.
• The user has not made any changes to the event or their calendar settings.

Any help or suggestions from the community would be greatly appreciated.

[#2]

Isn't there anyone who can give some insights on this case from this community?

[#3]

@janakkhadka 

How about message trace, any clue from this?