The spouse needs their own valid qualifying status and evidence for work permission. Dependent children do not receive the qualifying L spouse’s benefit.
Separate access from authorization
A referral, invitation or customer badge does not grant immigration status. Identify actual intended activities for each person. The dependent category is for a qualifying spouse or unmarried child under 21; each person needs valid status.
Immigration derivative status turns on a legal marriage recognised where it took place, and a common-law or domestic partnership does not qualify, however long standing and however documented. A spouse admitted in L-2 status is employment-authorized incident to that status, so the authorisation attaches on admission and does not become stronger because the specialized-knowledge showing was persuasive. If the spouse's record or circumstances are unclear, resolve that question rather than trying to change the principal's job classification to obtain a different family result.