if you're going to create an account online make certain that your credit report is not frozen. They use information from your credit report to verify your identity.
This is an intelligent guess, but I believe that you would need a form of government ID along with your Social Security Card; names matching on both. Yet, before spending time at the office, you may want to create an account online at SSA.gov. The secure website might be able to provide all the information that you need. Hope that helps.
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