Final answer:
Visa issuance is not a role related to national tourism offices regarding promotion; it falls under consular or immigration services.
Step-by-step explanation:
The role not related to national tourism offices regarding promotion is Visa issuance.
National tourism offices are primarily responsible for the promotion and marketing of a country as a travel destination. Their roles include literature distribution and fulfillment, ensuring that potential tourists have access to informative pamphlets and brochures; partnership development with airlines, travel agencies, and other relevant entities to boost tourism; marketing research and database development to understand target markets and craft effective marketing strategies; and package and tour development, creating attractive travel deals and itineraries for tourists. However, the issuance of visas falls under the jurisdiction of a country's consular services or immigration department, not its tourism office.