@Irin Sultana Thank you for reaching out to us, As I understand you are looking for information about Integrating RDG with Azure AD MFA using Hardware token.
This article https://learn.microsoft.com/en-us/azure/active-directory/authentication/howto-mfa-nps-extension-rdg refers to detailed steps of how to setup this with Azure MFA (MFA option depends on the configuration done for the user).
Let me know if my understanding of the issue is incorrect, feel free to post back so that we connect offline and discuss further on this.