Address it before your next international trip or extension filing, not after a problem surfaces at the border. Acquisitions can take effect long before daily duties visibly change, so waiting for an obvious disruption risks relying on an outdated support letter.
Resolve the employer and duty questions before the next official touchpoint
Set a personal deadline tied to your next planned trip or the expiration date on your current TN period, whichever comes first. Use that deadline to obtain the acquirer's written confirmation of your employer and duties, so any necessary new letter or petition is ready in time rather than assembled during a delay at a port of entry.
Build the schedule backward from the first day of proposed work and the date the current authorization ends. Allow time to obtain an employer letter, resolve credential questions, and decide whether the case will be presented during border inspection or through a USCIS petition. The first review should identify the one fact that cannot be left open—often the legal employer or a missing qualification record—and assign an owner and deadline. Hypothetical example: A speech-language pathologist has a job starting after a conference trip, but the employer will not finalize the duty description until the week before departure. She should not assume the travel date creates eligibility; the package must accurately describe the employment before she seeks classification. Avoid beginning work based on a planned outcome. A sequencing memo should show when the person may travel, when any visa step is needed, and what changes would require the materials to be reconsidered.