Move your mouse over the circled ?
just above the drop-down. It’ll tell you:
If you have been issued one of these documents from another country, but you do not remember the passport number or national identification card number and the year of expiration answer “UNKNOWN” in the passport number field and four zeros “0000” in the year of expiration field.
Credit:stackoverflow.com‘
4 Mar, 2024
4 Mar, 2024