Reassess the actual duties and the filing account. Do not rely on an earlier narrow description if material responsibilities have changed.
Review the change before relying on the original offer
Identify the added tasks, authority and effective date. Preserve the previous version and explain the revision so the credential and professional-activity assessment uses current facts. A business need to start quickly does not guarantee TN admission or authorize work under an outdated account. Coordinate the actual start with the authorization and role that have been assessed.
A timing review should tie each business date to the record that permits the next step, leaving room to correct a material inconsistency before travel or work begins. Confirm Canadian or Mexican citizenship, temporary professional activity, and an arrangement that is not substantive self-employment through the applicant’s controlled U.S. enterprise. The practical choice is whether the record is ready for inspection or requires the employer’s petition route first. Hypothetical example: a museum curator receives a changed letter two days before travel that adds responsibility for vendor negotiations.
That order avoids committing the business to a date before the relevant condition is documented.