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It is normal. Have you setup the shared mailbox as a secondary Exchange account?<br />
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<a href="https://www.msoutlook.info/question/new-mail-alert-for-delegate-or-shared-mailboxes" rel="ugc">https://www.msoutlook.info/question/new-mail-alert-for-delegate-or-shared-mailboxes</a><br />
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There are workarounds in the link above.
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Thank you Jackie - &nbsp;<br />
I gave multiple users full permission to this mailbox in EAC and the shared mailbox automatically added to the users outlook as additional mailbox. This is a cloud mailbox in a hybrid deployment. The users with on-prem &nbsp;mailbox can see the number of unread messages while the users who has cloud mailbox (o365) don't. They would have to manually click &quot;update folder&quot; in send/receive to view the number of unread messages.
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the shared mailbox automatically added to the users outlook as additional mailbox.
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Remove the shared mailbox and add it as a secondary Exchange account manually.<br />
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<a href="https://www.experts-exchange.com/questions/28613764/Is-there-a-way-to-get-Desktop-Alerts-for-a-Shared-Mailbox-in-Office-365.html" rel="ugc">https://www.experts-exchange.com/questions/28613764/Is-there-a-way-to-get-Desktop-Alerts-for-a-Shared-Mailbox-in-Office-365.html</a><br />
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Or try the method in the link above.
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FYI - I have already look at the link you provided above. I added the Inbox Favorites to no avail. &nbsp; I have a lot of other share mailboxes that don't have this problem.
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Does anyone know why some users are not getteing notificaiton when a shared mailbox receives new messages in outlook?
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Does anyone know why some users are not getteing notificaiton when a shared mailbox receives new messages in outlook?

New message notification in shared mailbox

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.