Was searching for tow ratings for the Envision, and figured I would aggregate them here for future reference:
Gen 1 - 2021-2026: 1,500 lbs
Gen 2 - 2016-2020: 1,500 lbs
Note that the first generation of Envisions (2016-2020) did have the option of the Active Package or Trailering Package. However, neither of these “unlocked” any higher of a tow rating. They simply were dealer installed packages that included items such as the receiver, 7 or 4 pin wiring harness, etc.
Sources:
https://www.bobrossbuickgmc.com/2020-buick-envision-towing-capacity/
https://www.kbb.com/buick/envision/2017/
https://www.motortrend.com/features/1702-2017-buick-envision-first-drive