Office 365 Share Mailbox in Apple Mail in macOS

Hi,

I want to add an shared Mailbox from Office365 to Apple Mail in macOS ( Monterey Build 12.2 (21D49)).

This is not working. Already tryed to solve the problem with die Microsoft Support but we could not figure out a working solution.

What we tryed is the following:

Creat IMAP Account manually in Apple Mail. Settings:

• E-Mail-Adresse: shared.mailbox@domain.com
• Username: your_mailbox@domain.com/shared.mailbox@domain.com
• Password: <Ihr Kennwort>
• Kontotyp: IMAP
• Incoming Server: outlook.office365.com
• Outgoing Server: smtp.office365.com

On Windows and an Android Smartphone this is working.

But on Apple Mail in macOS no chance.

You just get the Errormessage: "Username/Password could not be verified"

Please help me to find a solution! :)

Thank you and kind regards from Germany,

Max