Outlook connection issue after password change

Scenario:  User changes password but is then unable to connect to O365 Outlook mailbox and encounters sign in issues with O365 desktop apps.  A third party single sign on service is also used to assist authentication.

Workaround was to create and then delete a mailbox profile in the control panel mail applet.  Solve O365 desktop app sign in problems by a signout / signin and a windows logon / logoff.

Underlying cause: unknown
Suspicions: SSL inspection on perimeter firewalls