The Sage Advice Compendium has been updated as of today, October 1 2020 — while Sage Advice is DM advice only, and is not required for AL play, this update also includes links to new errata documents for Curse of Strahd, Ghosts of Saltmarsh, Storm King’s Thunder, Tomb of Annihilation, and Volo’s Guide to Monsters. This errata is used in AL play.
Existing characters that are impacted by changes to racial traits in the errata can be updated to reflect the newest rules.