A qualifying L spouse may work incident to valid dependent status with appropriate evidence, such as the spouse-specific I-94 classification. An offer alone or the principal’s approval alone does not supply that status.
Check immigration permission and professional requirements separately
Any licensing or employer credential requirements also need their own assessment. Qualifying unmarried children under 21 may accompany as L dependants but do not receive the spouse’s employment authorization.
For a two-year assignment the age limit rarely bites, but assignments extend. By arranging the child’s own status well before the birthday. Provide evidence of actual departures and returns and distinguish periods as a principal worker from periods as an L-2 dependent. Your knowledge does not itself establish the spouse’s permission to perform US work. Confirm the individual classification and validity instead of relying only on the principal’s petition. Do not use an employer’s reclassification letter as a substitute for the spouse’s own work-authorizing basis. The practical steps are about documentation and how quickly an American employer will accept it. Deciding early what happens at the end of the assignment is more useful than discovering the limit in year four.