Why no SSN
The Notary Geek workflow does not start with a U.S. KBA profile.
Notary Geek's identity-document workflow does not request or use SSN, ITIN, or U.S. public-record / proprietary-record KBA. A signer outside the United States can start with a non-U.S. passport. If the passport is the identity document, the signer needs the actual unexpired passport in hand for the check.
The practical point is simple: do not self-reject because you do not have a U.S. data footprint. Submit the identity-document registration first. There is no charge to complete that registration before scheduling, and it is better to find out from the workflow than to give up because another platform trained you to expect a KBA wall.
KBA is the older out-of-wallet question-and-answer model that tries to identify someone by asking database-based personal-history questions. In the RON market, it is often better described as U.S. public-record / proprietary-record KBA, not simply credit-history KBA. The questions may come from prior addresses, relatives or associates, property, phone, vehicle, public records, consumer records, and proprietary broker records.
That is not the same thing as checking a credit score or payment history. If a workflow were actually pulling a normal consumer credit report, you would expect FCRA-style permissions, disclosures, permissible-purpose handling, and sometimes credit-freeze or unlock friction. Most RON KBA does not behave like that. It behaves more like a data-broker identity-graph product.
There is also a practical security problem: KBA can be guessed, failed, and retried later in many workflows. The exact retry rules depend on the vendor and state rule, but the pool of possible out-of-wallet questions is often not large enough to justify treating KBA as a durable identity gold standard.