From Eurogamer: “Destiny 2 The Invitation is the first mission of the Season of Opulence, following an ‘Imperial Summons’ from our favourite sweeper bot Benedict 99-40.
From there, you have to complete a series of quest steps. At a first glance these are simple, but some – such as the Imperial Treasure Map within the Well of Flames, and what Challenges are in the Glorious Harvest bounty – can feel surprisingly opaque.”
Source: N4G PC Destiny 2 The Invitation quest steps: Imperial Treasure Map location, Glorious Harvest Challenges