If your business is set up as a sole proprietorship, then any estimated tax payments would be made as if you are paying from your individual account, hence the 1040-ES. It sounds like you may have set up your account as a business on the tax side of things, therefore the IRS would be expecting an estimated tax payment using a business voucher if you set it up as a business that would not be filed under your individual return.
Since it sounds like your business is set up as a sole proprietorship, your business information would be reported under your individual tax return on Schedule C. Please see this link for more guidance on how your business activity would be reported when you file your tax return.
As for the estimated tax payments, please see this link (as also provided by xmasbaby0 above) from the IRS to help guide you in making the estimated payments if you are filing as a sole proprietor on your personal return.
@checkyourmirrors
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