Outlook shows conflict errors when updating or cancelling meetings

This has been an ongoing issue since June 20. There's an advisory in M365 Admin Center. We've had 50 cases so far in our environment and have opened a case with Microsoft support. I suggest you do as well. Title: Users may intermittently be unable to update or cancel calendar items in the Outlook desktop client User impact: Users may intermittently be unable to update or cancel calendar items in the Outlook desktop client. More info: Users intermittently receive an error when updating or canceling calendar items that prevent these users from completing the intended action. 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: support.microsoft.com/en-us/office/outlook-shows-conflict-errors-when-updating-or-cancelling-meetings-69c26227-40ef-4377-8f12-1749fcaad2ad