Hi,
Thank you for sharing your question. I understand how frustrating it must be to have missed notifications for shared calendar updates, especially after nearly 72 hours without any alerts. Let’s figure out why you're not receiving those emails and how to solve it.
You might not be seeing notifications for a few reasons:
The calendar may not be fully upgraded to Microsoft’s new shared-calendar notification system, or your account might lack the required version of Outlook to support it properly.
Your browser or email app could be blocking notification messages from Outlook.com.
The shared calendar might be a shared mailbox calendar or group calendar, which has different settings and may require full access permissions before notifications can work.
To resolve this, try the following steps:
Sign out of Outlook on the web and sign back in, then revisit Settings → Calendar → Shared calendars, disable all calendars, save, and re-enable your specific calendar to refresh the notification setting.
Confirm that you’re running a supported version of Outlook (New Outlook or Outlook on the web). The shared‑calendar notifications feature has completed rollout for most users.
If this is a shared mailbox or group calendar, ensure you have full mailbox/calendar access rights—notifications for such calendars only appear when proper permissions are granted.
Check your email filters or junk/spam folder to ensure Outlook.com isn’t mistakenly filtering out these notifications.
Lastly, double‑check your browser and system notification settings, especially if you’re accessing through a Chromebook. In Chrome, under Settings → Privacy and security → Site Settings → Notifications, make sure Outlook is allowed to send notifications.
I hope this helps.
Best Regards,
Noel