Embed dashboard in

Hi,

We have our own Angular portal and I would like to embed the dashboard from Kibana into our portal.
Kibana uses our own SSO to login so when I try to login directly from Kibana it works fine. When I try to access the dashboard from our portal, the Login screen is displayed.
I was expecting to skip the login page but to automatically connect to the dashboard.
The url I'm using is https://.kb.ap-southeast-2.aws.found.io:9243/s/bmt/goto/

Am I missing anything? Should anything else be configured to allow auto login to Kibana from inside our portal if they both you the same SSO?
Obviously I read the page Authentication in Kibana | Kibana Guide [8.12] | Elastic

Thanks,
Zack