Web Portal SSO not working

Hi,

We have uploaded certs and have https://<servername>/IdentityManager loading the web page with login and password fields

However, for some reason SSO is not working. We have

- Active Directory user account (role based)

- Try single sign on, use the following module if single sign on fails checked

- optional setting being Active directory user account (manual/input role based)

Please advise what we're missing here. Thanks in advance for any help,