You must enter a verifiable Taxpayer Identification Number (TIN)—a Employer Identification Number (EIN) or Social Security Number (SSN)—in order to use Stripe.
Even when using an EIN to verify a business, you are still required to provide the SSN for the individuals associated with every US Stripe account.
If you do not have an EIN, you'll be asked to provide your SSN or Individual Taxpayer Identification Number (ITIN) instead.