I have looked all over the internet and haven't really found anything. The only thing that is disheartening is that if you registered as a business you may not be able to revert to sole proprietorship. There may be some confusion as to whether this might be an attempt to transfer ownership. Obviously, I don't really know. But what I would make sure of is that all the legal documents you submit have the exact same ownership name as the original ones you submitted.
You may consider trying to switch over to individual still using your EIN number as it appears that this may be possible.
"What kind of taxpayer ID do I need?
If you’re a sole proprietor—meaning you are not a business entity that is a corporation, partnership or limited liability company—you may use your Social Security number for tax filing and reporting. Otherwise, you need a federal employer identification number (EIN) to pay taxes as a business.
Even if you’re a sole proprietor Etsy shop owner, you can still opt to get an EIN. This gives you a few privileges: You can hire employees, incorporate, form a limited liability company or partnership, and have a solo 401(k) retirement plan. Using an EIN instead of a Social Security number can also help to protect against identity theft and establish you as an independent contractor, lending more credibility to your business."
Your taxpayer ID (Social Security Number) is indeed what is normally used for individual. You may try sending an email to support. I think you should be able to send one here https://help.etsy.com/hc/en-us/requests/new?segment=selling#issuelist_selling_on_etsy
I wouldn't suggest sending any personal information (such as SS#) in email. But there might be a better chance of it getting through to the right area this way. Good luck and keep us apprised of what happens.
