Hi,
I have one calendar event that I can't delete.
What I have tried:
Delete through Outlook, get error ''the client operation failed''
Delete through OWA --> can delete, but when refresh the page it comes back.
Delete using the search-mailbox powershell command (search-mailbox -identity <mailbox> -searchquery 'Subject:"Subject"' -Deletecontent)
Delete using the remove calendarevent powershell command (remove-calendarevents -identity <mailbox> -cancelorganizedmeetings -querystartdate "5/26/2021" -querywindowindays 1)
I can't open the calendar event, get the following error --> there is currently a problem opening item. this may be temporary, but if it happens again, you may need to restart outlook. the client operation failed
The irritating part is that always a calender event reminder pops up in outlook.
Can someone help me assist in this?
thanks in advance.

