All documents have some sort of document number that is tied specifically to that document tailored for you. It is used by the government to identify your file quickly in their government database. Please have a look here: https://www.quora.com/What-is-the-document-number-for-a-passport
Please make sure that you have the latest version when completing the KYC.
Latest iOS version – 1.0.191
Latest Android version – 1.0.1225