Check whether both you and the offered work fit the TN requirements before treating TN as an available route. A company’s willingness to hire you does not establish that its position belongs to a listed profession. Request a substantive job description and compare it with your actual qualifications.
Use the offer review to expose missing information
Ask the employer to distinguish essential professional duties from general business support. Then identify the listed category being considered and the credential route it actually permits. Record uncertain points instead of answering them with a more convenient job title.
Your acceptance decision may also depend on matters outside immigration, such as salary, benefits and notice obligations. Discuss those separately so that a strong compensation package does not obscure an unresolved eligibility problem. A first review usually produces three lists rather than an answer: facts that are settled, facts that one person asserted and nobody has verified, and questions that require the employer to go back to the business.
Treat the second list as the risky one. The governing condition is that the position must fall within a profession listed in the USMCA appendix and that you must hold the specific qualification that listing requires; a job resembling a listed profession but staffed by someone with a different credential generally fails on the second half even when the first half looks satisfied. Ask the employer to identify, in writing, which listed profession it believes applies.
If nobody at the company can name one, that absence is itself the finding, and it is better to have it before a resignation than after.