Why do Canadian immigrants still have to go for an interview after getting a visa?

Needs further review. In the Canadian immigration application process, visa clearance is the first step. Only after you get your visa will the Immigration Bureau have information about your visa clearance, and you will receive an interview notice after a period of time. You do not have an interview right after you get your visa. The Canadian Immigration Service will also review the visa information of the immigration applicants one by one and issue interview notices.