O365 Send Mail from Shared Mailbox

My wife and I have mailboxes on an O365 (M365) tenant and our home has a shared email/calendar. I have the home calendar appearing in the O365 Integration under HACS, but can’t send email as anything but me (the tenant admin).

How do I send email from the home on the shared mailbox or from my wife’s account? Neither has a notify object.

Anyone have any ideas how to create these additional notify objects?