The Log in with IT Complete option will only be available to each user after the global IT Complete SSO setting for that module has been enabled by that module's Administrator. That Administrator also needs to be a Master user in KaseyaOne. Once it is enabled globally, each user must personally enable SSO with KaseyaOne from within each module.  Follow the steps in the document attached to enable SSO globally and personally for each module.

*If you are using another IDP to log into your modules (like Microsoft, Passly, etc.) and enable Log in with IT Complete, this will replace your existing IDP login method.