In Baldur's Gate: Descent Into Avernus, one of the main possible endings features the redemption of the archdevil Zariel. However, I understand that Adventurers League is run as its own ongoing campaign with its own timeline. In the story of D&D Adventurers League, has Zariel been redeemed?
I checked DDAL09-20 Where Devils Fear to Tread, the last adventure of Avernus Rising. The adventure mentions Zariel 12 times, but never indicates or implies that she's been redeemed. As to where she is, it only has this to say:
! Zariel herself is nowhere to be seen. Nothing could have kept her from defending Avernus, but the battle stretches beyond the horizon so it is likely that her attention is elsewhere—such as wherever Yeenoghu’s vassal Doresain, the King of Ghouls, has taken the field—when it is sorely needed here.
Zariel's actions could be different in every game. Not all games redeem Zariel. The three main headings of options in Chapter 5 are: Redeeming Zariel, Zariel's Wrath [fighting her], and Serving Zariel [helping her rule Avernus].
Since every AL completion of Baldur's Gate: Descent Into Avernus can have a different outcome, it is not possible to have a single Adventurers' League timeline.