The OTP generated by Kron PAM can be sent to users via Email. Using Email for MFA works with SMS, that is, both SMS and Email are sent at the same time.
To adjust the MFA Email Settings:
Navigate to Administration > System Configuration Manager.
Click on to Add Button and select Add New System Parameter.
Set the parameters: iga.2fa.send.token.via.email = true and iga.2fa.sms.http.enabled=true
Navigate to the 2FA Provisioning Screen enable OTP and select Enable SMS for the user group.