Yes, I got it to work by using SSN, since that's the info in the IRS database, even for the business activities because it is a single-member LLC, so IRS disregards the business entity for filing purposes.  I have an EIN, but can't use it because IRS doesn't recognize it, since I never filed with it, because they disallow it.  So, no matter.  It's still for the business, but is all filed together with personal income.  Since you guys payout through Paypal generally,  the bank account linkage is all controlled by me, so I can keep distinct bank records for business which is my goal.   I would like to use the EIN to keep things truly distinct, but those are the IRS rules I guess.  

So, in light of this, one more general question...  to get through the tax interview, if you have a new EIN that you have never filed taxes with IRS before, would it be rejected until you have filed with IRS at least once?   Say, my business status changes from single-member LLC and I add an employee.  IRS would then allow me to file distinctly for the business under the EIN, but the EIN wouldn't be in the database until I file, correct?  So, it wouldn't be allowed on itch.io, being rejected by the tax interview?   I suppose this would be a question relevant for all new businesses with multiple employees in the year they form as well.   Would they not be allowed to use the EIN on itch.io until the following year after they formed/incorporated, being rejected during the tax interview because it is not in the IRS database yet?   Or is this only an issue with single-member companies that maybe the IRS removes the EIN from their database?