Help needed: Amazon Seller Central Tax Interview Questions

Hello Guys,
I am relatively new to Amazon FBA and need some help.
I upgraded from personal to business account. Filled out everything in the Tax preparation form in Amazon Central Seller. After few weeks, I got email from Amazon saying I need to update my tax identity as it did not match with the IRS. I talked to the Amazon rep and told me the name should be exact as stated in IRS document (caps and small letter matters)

Could you please suggest if I am doing something else wrong in the Tax interview page in Amazon Seller Central.

Federal Tax Classification: S Corporation (Mine is Sole Proprietary LLC)
Name: My Amazon Store Name
Business or trade name (Optional): Blank
Addresses: My address
EIN: As provided by IRS

They told me if I do not update the tax identity within 30 days, my account will be suspended.
Should I call them and ask for help to fill out this tax identity form?
Please advise.