Required values are: Email address to invite - the user who will receive an invitation Redirection url - the URL to which the invited user is forwarded after accepting the invitation. If you want to forward the user to the My Apps page, you must change this value to https://myapps.microsoft.com or https://myapplications.microsoft.com. Reference: https://docs.microsoft.com/en-us/azure/active-directory/external-identities/tutorial-bulk- invite#invite-guest-users-in-bulk