The client received the written pre-approval to enter Canada three weeks after applying, and the write-up reproduces the approval letter. The client was entering on an accompanying dependant visa.
The post explains that before departure the traveller must obtain the pre-approval email, which is issued to immediate family members (spouse, children, parents) of citizens, permanent residents and study permit holders who hold a valid visitor visa or eTA and genuinely need to enter. The example given is an applicant entering on a study permit while an accompanying parent, child or spouse enters on a dependant visa.
It states that foreign nationals were generally barred from entering at that time, but that children travelling with a parent and a parent accompanying a child to care for them were being allowed in, and that non-essential travel and entry remained prohibited. Accompanying family members holding a visitor visa or eTA must have the pre-approval email before leaving Korea.
The write-up notes that the airline checks the written pre-approval at departure and decides whether the passenger may fly, that without it departure becomes difficult, and that requirements vary by airline, with Air Canada requiring it without exception.