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Last tested: Sep 17, 2020
If a user sees this warning when they test the authentication, the values from Google OAuth will override the values of 'x' (first_name, last_name, etc.) in Looker.
When the unique id matches (email usually) then we pull all the attributes from IDP and overwrite what is set in Looker. Think about when you have it already enabled, if you edit a user in Looker it will stick around until the next time they login, then reset the value to what is in the IDP.