Embed User Create Best Practices

We are implementing a few Looker dashboards in our portal via the SSO embed.

What are the pros and cons of the automatic embed user creation?  Meaning, should we have one user from our portal, users per access filter attribute, or all users?  

We are leaning toward one user per access filter attribute (customer_id for us) and letting our portal handle access by user to that “group” (really the customer_id).

Thanks!

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