Hi @MASCI, RICHARD G ,
According to my research, you can configure how you want to view your meeting reminders, you can choose between the familiar in-app notification, or the new macOS-based notifications for time sensitive events.
Here is an official document for your reference: https://insider.microsoft365.com/en-us/blog/see-your-meeting-reminders-in-the-macos-notification-center
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