but this one works and returns the user's own emails: https://graph.microsoft.com/v1.0/users/userAtcompanyDotcom/mailFolders 4) I am able to see the shared mailbox in the Outlook desktop app and on office 365 online app as well. What are we missing?
In this situation, the second user may still require permissions to access specific folders in the mailbox. The mailbox owner must use Outlook to set these permissions. For detailed steps about how to use Outlook to give a user the ability to send mail on your behalf, seeHow to Use Outlo...
To send an e-mail on behalf of another mailbox in Outlook or OWA, add theFromfield to the interface. When creating a new e-mail message, select the sender’s e-mail address in the From (or selectOther Email Addressand find the owner from the Global Address List). In an on-premises...