Looker External user id for multiple users

[Abhijsrwala]

Hi

I am planning to embedd looker dashboard for my organization. I need to generate SSO enabled url for this, but I can generate it for only 1 user at a time. How to generate a url for 1000 users, which then filters the data according to each user's roles. 

I have been hunting this for a couple of months now, but can't figure anything. Looker team, support, documentation, forum nothing helps or no one knows. 

Appreciate the efforts if anyone can help. 

Thanks.