Immigration and cross-border practices often have signers spread across states and countries, which can make them buyers of remote online notarization and multi-state coverage. Two questions come first. Who decides how documents get notarized: the law firm, or the employer client whose people are signing? And how spread out are the signers? If the employer client runs the process, the firm may not be your buyer at all.
Overseas signers need care: the State Department says some U.S. states may allow remote notarization, possibly limited to documents notarized in their physical jurisdiction, and it tells people abroad to check with both the U.S. state and the foreign destination. One in-person option is a U.S. embassy or consulate, which notarizes only in person, offers no remote service and charges $50 for each consular seal. If a document needs certifying for use abroad, the destination decides which certificate: an apostille for countries in the 1961 Hague Convention, an authentication certificate for the rest. For a document notarized in a U.S. state, that step starts with the state, not with you. Never promise a firm that a document will be accepted abroad or can skip that step.
Federal law won't settle it for you either. Under the ESIGN Act, when a law requires a signature or record relating to a transaction in interstate or foreign commerce to be notarized, the notary's electronic signature, with the information the law requires attached to or logically associated with it, meets that requirement. It does not by itself let a notary act over video, which depends on the law of the state that commissioned the notary. That ESIGN rule also does not reach records governed by the law on creating and executing wills, codicils and testamentary trusts, or court orders and official court documents required to be executed in connection with court proceedings. More in selling remote online notarization to businesses.
One piece of immigration-adjacent work isn't notary work at all. An employer can name a notary as its authorized representative for Section 2 of Form I-9, but USCIS says that person is not acting as a notary and should not apply a notary seal. State law can restrict this work, so check your commissioning state first. See what notaries can and cannot do as I-9 authorized representatives.