After discussions with the email administration team in IT and some testing, we've found a quicker way to directly access your Office 365 webmail outside of the Outlook client (locally installed on your PC).
If you go to (https://outlook.office365.com/owa/shu.edu), you can sign directly into your Office 365 webmail:
(e.g., circulation@shu.edu, libtimeoff@shu.edu, archives@shu.edu, walshgallery@shu.edu, interlib@shu.edu, library@shu.edu, copyright@shu.edu, erepository@shu.edu)
Method 1: Access via a direct URL
Add the email address for the shared mailbox to the end of this URL (where "XXXX" stands for the shared mailbox address):
https://outlook.office365.com/owa/XXXX
Method 2: Access via your own Office 365 Mailbox
Once you are signed in to your own webmail (following my instructions above, in the "Webmail" box, or via PirateNet/Okta sign-on), you can click on the person icon (or your picture, if you uploaded one) to bring up a list of options. Choose, “Open another mailbox…”.
Then, enter the name of the mailbox you are a part of. It may automatically populate in a drop-down field. If not, type the full address (e.g., library@shu.edu). Then, you can click on the mailbox to select it, and click the “Open” button.
Once you have done this, a new tab will open in your web browser with the shared mailbox. You should still have a tab open for your own mailbox as well.
All of this said, you can still use the local Outlook client to access your SHU email and shared mailboxes. Continue to enter tickets for email issues or requests to add shared mailboxes to your local Outlook client vs. webmail if you would prefer to.