Cannot access my Seller Account

Hi everyone,
After spending two days trying to get help from Amazon with no success, I’m hoping someone here might have some insight on how to move forward.

About a year ago, a seller account was created under my name and address. The person who set it up doesn’t remember which email was used. I’m now trying to gain access to that account so I can use it myself.

When I contact Amazon, they say they can only help if I provide the email address, phone number, or an order number associated with the account—none of which I have.

Is that really the only way to recover a lost account? Doesn’t Amazon have a process where they can verify your identity using your name, address, or even SSN to grant access?