Hi @Mike Martinelli ,
Thanks for your reply!
As i know, we can't change the details for meetings or events other people have invited you to. Based on my test, when i click Accept and choose Send the Response Now/Do Not Send a Response of a received meeting, the meeting will be closed. If it is not your case, please provide more steps about your test.
More information about editing a calendar item that you created: Change an appointment, meeting, or event in Outlook.
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