That's the expected behavior, reminders only work for mailboxes you have added as additional accounts within the same profile, not automapped/added as additional mailbox. The same applies to new message notification, etc. In other words, if you want the "full" experience, consider using method 2 as detailed here: https://www.msoutlook.info/question/new-mail-alert-for-delegate-or-shared-mailboxes
Office 365 Shared Mailbox reminder not working
Hey all,
I have several shared mailboxes attached on my Outlook client. When using flags and reminders on my personal mailbox, I get the notifications when they are due. Unfortunately this is not the case for the shared mailboxes. Has anyone come across this issue and possibly have a solution?
Thanks
Mihail
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Vasil Michev 119.6K Reputation points MVP Volunteer Moderator
2020-12-10T15:32:04.013+00:00
1 additional answer
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Joyce Shen - MSFT 16,701 Reputation points
2020-12-11T02:46:36.023+00:00 Agree with the reply above fro michev, outlook only supports firing reminders in your own mailbox or default PST file. And as suggested above, we will need to give full access permission to shared mailbox and add this shared mailbox as second Exchange account in Outlook.
Here is a related thread discussed the similar issue for your reference: Outlook 365 - reminders not working for shared calendar
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