Users may intermittently be unable to update or cancel calendar items in the Outlook desktop client
Users intermittently receive an error when updating or canceling calendar items that prevent these users from completing the intended action.
Users may be able to bypass impact by clicking through the error to complete the intended operation. Additionally, users can bypass impact by updating meetings using Outlook on the web or new Outlook desktop client.
Additional information on the end user experience and error messages being received can be found here: https://support.microsoft.com/en-us/office/outlook-shows-conflict-errors-when-updating-or-cancelling-meetings-69c26227-40ef-4377-8f12-1749fcaad2ad
Webmail or utilizing New Outlook App is the current work around.
