Corporate appointment and US work authorization are separate questions.
Assess the actual role and status
A qualifying L spouse may work incident to appropriate status with required evidence. Do not infer permission from meeting invitations, ownership or the principal’s proposed transfer.
First identify the spouse's anticipated US activity and the status each family member will hold. A qualifying L-2 spouse is employment-authorized incident to status, with appropriate status evidence, but a corporate appointment or committee vote creates no immigration permission by itself. L-2 children do not receive the spouse's work authorization. The principal's L-1A petition must still prove the related active organizations, one continuous qualifying foreign year in the previous three and a US role that is primarily managerial or executive. Canadian permanent residence and Canadian citizenship should be recorded separately because neither substitutes for those L-1 elements. Do not schedule paid meetings for the spouse before the necessary L-2 status begins.
Hypothetical example: A Bégin wood-products wholesaler plans to transfer its operations director. His spouse is named to an advisory committee and expects honoraria for quarterly meetings. The family should time travel and status documentation before she performs compensated duties, then retain evidence of her L-2 classification. Her committee membership does not independently authorize work, while the principal's organization charts and foreign payroll must support his own transfer.