The offer has to involve prearranged professional work in a listed occupation, and the applicant has to meet that occupation's own qualification and citizenship requirements. A job title alone, or a Canadian mailing address, does not establish either.
Compare the duties and the profession's own rule
Lay the duty description next to the listed occupation's stated criteria and identify a document supporting each qualification, flagging any task that genuinely needs classification review. If the employer later revises the role, review the revised facts rather than continuing to rely on the original offer. It is a legitimate outcome of an early review to find that the proposed profession does not fit; the paperwork should reflect the real job rather than be shaped to force a match.
TN eligibility is assessed from the real role, not a label selected after the fact. Confirm the applicant’s citizenship, the listed profession, and the exact credential or licence that category calls for; then compare the offer’s recurring duties with that profession. The employer should also identify whether the work is for its own operation or a client, because supervision and control matter. Hypothetical example: an industrial-hygiene consultant is hired to evaluate ventilation in a semiconductor clean room. Her graduate training is relevant, but the file still needs a duty description showing professional analysis rather than routine safety monitoring. A credential transcript and the signed scope of work settle different questions. If she owns the consulting company that receives the fee, TN is not the vehicle for that owner-operated service. Canadian applicants can seek admission during inspection, while an employer may request USCIS classification with Form I-129 when that process fits the case.