Implement 2FA for Raspberry Pi

i am trying to enable 2FA in my raspberry pi board
i have added google-authenticator-libpam to my build. I have followed these steps, which are mentioned below.

1.Added google-authenticator-libpam pack in my build
2.add the **auth equired pam_google_authenticator.so nullok** line in sshd file which is located in the /etc/pam.d/ directory
3.set the value **yes** to **KbdInteractiveAuthentication** in the sshd_config file which is located in the /etc/sshd/ directory
4.Generate the code and done as per guidance

but here 2FA is not enabled.
shall i need more configuration?