OTP Code Access

I have a website that the login access requires to type in OTP code that send to email before login to account dashboard. The OTP code generate every time in admin portal and it will be send to user email .. Now some email domain are blocked the server to receive the code. I want the new OTP code that generated in user account in admin portal to be automatically show in the OTP code column during the login access of the user to enable the user gain access to the account dashboard.