[The Hub Client] SSO for client users should login in as the client not the account owner

At the moment, the SSO feature in The Hub Client will log anybody that uses it in as the WPMU Dev account owner. Shouldn’t this really be logging into the relevant site as the actual user?

Ignoring the actual user and logging into the site as the WPMU Dev account owner is an issue for several reasons, including potentially overriding any lower permissions a client user might have on a site. Additionally any audit logging will show the WPMU Dev account owner user as the one doing everything when in fact this isn’t the case.