Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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Is it possible to use a shared mailbox for SMTP AUTH (Scan-to-Email) or does it need to be a regular user mailbox with 1 exchange online license?
A shared mailbox's account is disabled, so not possible. It needs to be licensed as a regular mailbox.
See my response:
Now, Having said that. If you were to use a different authenticated, licensed account that has SEND AS rights to that shared mailbox, that should work in theory.