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To apply for a work permit, the applicant must be in the possession of a valid “Non-Immigrant” visa at the time they process the work permit application. However you can start the work permit application for the purpose of obtaining a Non-Immigrant B visa. These statements are diametrically opposite.
There are a variety of possible reasons for the grant of a work permit. It is discretionary and will take into account various considerations such as relevance and any requirements of a foreigner for the position