pam_prompt() Giving Conversation failed RHEL 9.4 when used with SSH

I have build a custom pam module to add MFA.

After entering password I have used pam_prompt() function to display options for MFA and take user input.

That pam_prompt() is returning code 19 (PAM_CONV_ERR) "Conversation Failed" with SSH.

Same function when used by UI to Display MFA list is working fine.

Any idea of it.

Same is working on RHEL 8. I am currently using RHEL 9.4

Code where I am sing pam_prompt function

int pam_result = pam_prompt(pamh, PAM_PROMPT_ECHO_ON, &p, "%s", prompt);if (pam_result != PAM_SUCCESS) {    sprintf(msg, "[ERROR] pam_prompt failed with code: %d", pam_result);    debug(pamh, msg);    return pam_result;}

my sshd file on test machine

#%PAM-1.0auth       substack     password-authauth       include      postloginaccount    required     pam_sepermit.soaccount    required     pam_nologin.soaccount    include      password-authpassword   include      password-auth# pam_selinux.so close should be the first session rulesession    required     pam_selinux.so closesession    required     pam_loginuid.so# pam_selinux.so open should only be followed by sessions to be executed in the user contextsession    required     pam_selinux.so open env_paramssession    required     pam_namespace.sosession    optional     pam_keyinit.so force revokesession    optional     pam_motd.sosession    include      password-authsession    include      postloginauth       required     pam_otp.so config=/etc/pam_otp.conf use_first_pass

Usecase:

After installing my custom pam module by adding it at the end of sshd file"auth required pam_otp.sp".When I take ssh using"ssh username@ip" it prompts for password.After entering the password control goes to my pam module for MFA. Now next it should show the list of MFA options available. For that I have used the above code that has pam_prompt() function.

That is giving above mentioned error.

This problem has arrived only with RHEL 9. Till 8 its working fine