After upgrading the AWI, it may be that the signon screen no longer has the "Login Type" field available. This is needed to switch between Automation Engine, SAML, and/or Kerberos Login types.
Caused by not having the correct setting in the configuration.properties file
Release : 12.3
Component : Automic Web Interface
In order to get this to show up, put the following setting into the configuration.properties file in the AWI's config folder:
This should allow the other Login Types to show up at the AWI login page.
Additional information on SSO Setup can be found in the documentation: https://docs.automic.com/documentation/webhelp/english/AA/12.3/DOCU/12.3/Automic%20Automation%20Guides/help.htm#Installation_Common/install_SSO_setup.htm