Bypass MFA authentication in Outlook Web App for delegated mailboxes with full access
We are using Outlook Web App and exchange online from Office 365. Some mailboxes uses delegation feature with send as and full access from user A to user B. This works fine.
But if we activate MFA authentication on user B then MFA authentication gets active if user A want to access Mailbox of user B via Outlook Web App. In this case MFA authencitation should be bypassed, because user A is already authenticated with his own credentials.