New message notification in shared mailbox

Does anyone know why some users are not getteing notificaiton when a shared mailbox receives new messages in outlook?
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Jackie Man IT ManagerCommented:
It is normal. Have you setup the shared mailbox as a secondary Exchange account?

There are workarounds in the link above.
NegashAuthor Commented:
Thank you Jackie -  
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  mailbox can see the number of unread messages while the users who has cloud mailbox (o365) don't. They would have to manually click "update folder" in send/receive to view the number of unread messages.
Jackie Man IT ManagerCommented:
the shared mailbox automatically added to the users outlook as additional mailbox.

Remove the shared mailbox and add it as a secondary Exchange account manually.

Or try the method in the link above.
NegashAuthor Commented:
FYI - I have already look at the link you provided above. I added the Inbox Favorites to no avail.   I have a lot of other share mailboxes that don't have this problem.
Jackie Man IT ManagerCommented:
If you setup the shared Exchange account as a mail profile, you will see the same notification like your main mail profile.

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