#550 5.7.1 RESOLVER.RST.NotAuthorized; ## – Calendar Invite undelivered on behalf of


Outlook shows warning that a calendar invitation cannot be sent on behalf of another mailbox


#550 5.7.1 RESOLVER.RST.NotAuthorized; not authorized ## – Calendar Invite undelivered when sent on behalf of another/secondary/shared mailbox


The mailbox from which the calendar invite has to be sent must be primary always. 

Option 1: Configure the shared /alternate/secondary mailbox as primary account in outlook profile

Option 2: Access Shared/secondary/alternate mailbox calendar from Outlook Web Access (OWA)/Webmail and send the invite. 

Undeliverable Calendar Invite   Undeliverable Calendar Invite


Security Tab missing in folder properties

If security tab is missing for a folder property, follow below steps to resolve the issue

  1. Go to Tools –> Folder Options –> View
  2. In Advanced Settings, scroll down to bottom till you find “Use simple file sharing (Recommended)”
  3. Uncheck the box and click OK.

Now you can see Security Tab in folder properties