Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello Roland Okorie,
Based on your requirement, I did a test on my side and the result returned that you can add the shared mailbox as a secondary mailbox. Then you will get desktop alert when the emails come to shared mailbox. To do that, the steps are as follows:
1. In Outlook, click File > Add Account.
2. Then type the email address of the shared mailbox and click Connect and select Microsoft 365.
3. You will be asked for password. Since the shared mailbox doesn't have its own password, here we select Sign in with another account to change the email address to sign in.
4. Type your own account and password, then select Finish.
5. Restart the Outlook for the changes to take effect.
6. Go to File > Options > Mail and check if Display a Desktop Alert option is selected.
If you need more help, please feel free to let me know.
Regards,
Seven