This page explains how to complete the level 90 post-Endwalker quest "Bonds of Trust".
This quest is available if you have completed the quest The Fallen Empire.
Starting the Quest
Talk to Jullus in Garlemald to begin the quest.
Go north to exit the train station, then go northwest to where the orange arrow is pointing in the minimap. Dismount and enter the purple circle, then defeat the Runaway Satellite.
Check on Mettius to proceed. There will be a cutscene.
Speak with Zero
Talk to Zero to complete the quest. There will be a cutscene.
Next Main Scenario Quest
After you complete the quest, talk to Urianger to accept the next quest: Lunar Rendezvous. There will be a cutscene.