Feb. 2022, “IEEE Std 1901b-2021 was Published.”, IEEE SA

1901b-2021 - IEEE Standard for Broadband over Power Line Networks: Medium Access Control and Physical Layer Specifications Amendment 2: Enhancements for Authentication and Authorization

Abstract:
State-of-the-art authentication and authorization mechanisms for networks, especially for IoT and access devices, are integrated in this amendment. Specifications for how IEEE Std 802.1X may be utilized for authentication and authorization by IEEE 1901 networks are provided in this amendment.

This standard is available here.