If the passport number on a submitted Canada eTA application is wrong, IRCC says to apply again and enter the correct information. The correction is a new application using the passport number from the passport you will use to travel to Canada. This is not a detail to leave until check-in. IRCC warns that an incorrect passport number may prevent you from boarding your flight. Reapply With the Travel Passport Start with the passport itself. The passport number required for the application is the number from the passport you will present for travel to Canada, because the eTA is linked to that passport. ...

Which passport you use for a Canada-bound flight depends on your citizenship status. The rules differ significantly depending on whether one of your citizenships is Canadian. Dual Canadian citizens: a Canadian passport is required for air travel Dual Canadian citizens can no longer travel to or transit through Canada by air with a non-Canadian passport. Canadian citizens, including dual citizens, can’t apply for an eTA and need a valid Canadian passport to travel to Canada by air. ...