https://www.bleepingcomputer.com/news/security/google-to-force-oauth-in-g-suite-to-increase-security/

Google announced that it will block less secure apps (LSAs) from accessing G Suite account data starting February 2021, following an initial stage of limiting their access during June 2020.

This announcement follows the removal of the "Enforce access to less secure apps for all users" setting from the Google Admin console on October 30, 2019.