I went to the ASC in Riverside, CA. There were a bunch of people in there accompanying the ones that were waiting for their name to be called. It will depend on the ASC you go to.
None of them had to provide ID like the above poster said.
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Self filed AOS │Apps Received By USCIS - 3/18/19
│Biometrics Done - 4/11/19
Interview Scheduled - 4/24/19│Interview Date - 5/31/19│AOS Approval - 5/31/19
Permanent Resident Card Received - 6/8/19