Me again!
I got myself a mailbox because apparently all the cool kids have them. I set my mailbox access to Co-owners so my accounts can access my mailbox, but only my primary account can access it. I've looked for information online to see if this is intended or not (if it is, the security settings are pointless). Is this intended?

Primary account

Second account co-ownered trying to access
I got myself a mailbox because apparently all the cool kids have them. I set my mailbox access to Co-owners so my accounts can access my mailbox, but only my primary account can access it. I've looked for information online to see if this is intended or not (if it is, the security settings are pointless). Is this intended?

Primary account

Second account co-ownered trying to access