Dear @Chris Byrd,
Thank you for reaching out Microsoft Q&A!
Firstly, you can check it to make sure you turn on reminder time: Open New Outlook. Navigate to Settings > Calendar > Events and Invitations. Set a default reminder time (e.g., 15 minutes) for all events.
Microsoft has acknowledged that notification support for shared and secondary calendars is still being improved in New Outlook. Notifications (pop-ups, reminders, alerts) are only triggered for events created in the default calendar. Events added to secondary or shared calendars do not automatically generate notifications unless manually configured. Here’re some information I researched:
- Default Calendar Notification Behavior: How to enable and disable the Outlook calendar sharing updates - Microsoft Support
Microsoft states that meeting requests and appointments are saved to the default calendar of the email account. If a different calendar is used, notifications may not appear unless it is set as the default. - Shared Calendar Notification Limitations: Add or delete notifications or reminders in Outlook - Microsoft Support
Microsoft explains that shared calendars must be upgraded to the new sharing model in Microsoft 365 to support notifications. Even then, users must restart Outlook for changes to take effect. - Manual Configuration Required for Shared Calendars: Set default calendar - Microsoft Support
To receive notifications from shared calendars, users must manually enable email alerts for updates to shared events. - Notification Scope: Outlook’s notification system is primarily scoped to the default calendar associated with your primary account.
- Shared/Secondary Calendars: These calendars may not support notifications unless they are upgraded or manually configured.
Because of that, you can try yo use Outlook Web as a Workaround via https://outlook.office.may offers better support for shared calendar notifications.
And make sure you have the latest version update New Outlook, you can check here: Release notes for Outlook for Windows (new) - Office release notes | Microsoft Learn
Sorry for the inconvinience it has caused. I hope this information helpful for you!
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