How to use SessionTags in GenerateEmbedUrlForRegisteredUser

I would like to generate the registered user embedding url for the user which is not IAM user.
Also would like to use RLS for the dashboard.
Can anyone explain the approach ?

A registered user needs to be a quicksight user. Why would you not want to use IAM?

Secondly, for RLS you can do either with a registered user or anonymous.