How to generate Outlook email from a shared mailbox

Question

I figured out how to send the email but having it sent from the shared mailbox has been a huge challenge.

I tried .SentonBehalfofName which ends up showing my primary account address in the properties

I followed a tutorial to loop you through account number and change .sendusingccount.
There is no other account number since it is a shared mailbox so changing outapp.sessions.accounts.item does nothing.

Answer 1

Add the shared mailbox to your Outlook profile then there will be an account number.

Add an email account to Outlook