Once you successfully configured the Azure AD service and specified Azure AD as the user authentication method, you can log on to the TMWS proxy server to verify your setup. After the Azure AD logon verifies your account, you can visit the Internet.
TMWS does not support testing single sign-on from the Azure AD portal, under Overview > Single sign-on > Set up Single Sign-on with SAML > Test single sign-on with Trend Micro Web Security(TMWS).
For details, see Traffic Forwarding Using PAC Files.
TMWS will direct you to the TMWS captive portal.
TMWS sends you to the Azure AD logon.
You should successfully log on to TMWS.