Ambassadors — Urantia Wiki

In the Urantia Book

on a neighboring planet the most superior nation is projecting to establish ambassadorial relations with surrounding nations 72:12.2
primitive peace treaties consisted in “blood bonds”, in which ambassadors sucked each other’s blood 70:3.10
sending ambassadors dates from Adam; great step forward 74:5.8

Ambassadors are appointed by judicial decree and represent universes to other universes. 33:6.4
Melchizedeks serve as ambassadors to other universes 35:1.4
The superuniverses do not maintain any sort of ambassadorial representation; they are completely isolated from each other. 15:10.23
Solitary Messengers serve as temporary ambassadors 23:2.22-23
The Paradise Spiritual Sons, upon certification they may become spiritual ambassadors representing the local universes of their service. 20:8.1
Vorondadeks serve as ambassadors to other universes 35:5.5

Ambassadors is linked in 3 paragraphs of the text.