^^^ Once the Andorian scientists identified the brain wave pattern, does it make sense that the high mucky mucky of the Andorian State would personally contact a city of two thousand to tell them John and Shran will be paying a visit?
Lissan: "I know your name because the Andorian Chancellor contacted us."
"Andorian Chancellor" would more likely be analogous to a upper level administrator, or maybe a cabinet secretary.
USS Einstein wrote:
Does the Andorian Empire have an emperor in the Federation?
The term "Empire" would suggest a single supreme authority, a emperor, empress or other monarch.