Yes, SapphireIMS do support SAML and OAuth2 based authentication. We support SAML based directories authentication such as ADFS and we also support integration with Google G suite and Office 365 using OAuth2 protocol.
Please refer following help links for more details -
SAML 2.0: Configuring SAML
Google oAuth2 : Configuring OAuth2 - Google
Office 365 oAuth2: Configuring OAuth2- Office 365