OpenSource 2fa/mfa for RDP/AD RDS?

Question

RDP

Recommend good proven applications for two-factor authentication (preferably in the form of a one-time password from a mobile application)
Planned to be implemented for Active Directory (Remote Destop Services)
Preferably on Unix, it is extremely important with flexible settings groups of machines/users, etc., mail logging)

Answer 1

multiotp service (works both on windows and linux/docker)