Yeah, immigration is supposed to send your info to SS so they can clear you for a SSC. If you go before the 10 days after receiving your EAD, they will have to request verification.
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Application sent: June 18, 2013 / Application received (NSC): June 20, 2013 / Biometrics scheduled for: August 1, 2013/ Request for Evidence: October 2, 2013 (valid, up-to-date ID) / RFE Received: October 16, 2013 / DACA/EAD Approved: October 29, 2013