Trouble finding SAML SSO section in Sanity.io project page

hi everyone - very new to this community, so please forgive me if I'm missing protocol. I am trying to set up SAML SSO on my project which I recently upgraded to Business plan. I'm following this doc - https://www.sanity.io/docs/sso-saml but can't get pass the first step because I can't find the "SAML SSO section in the left sidebar" on my project page. Can someone help please?

I think the SAML SSO should be set up at the organisation level, not the project level (see difference in this doc ).Try selecting the
organisation in the manage portal (not the project) and see if you can find the option there.

that was it. thank you so much.