Hi i deployed my MERN app to vercel and it's working fine but whenever i try to send an email (using gmail protocol) it didn't get send also it doesn't show any error i am so confused as it's working fine on my local system but not when hosted here is my backend link for registration page where i am trying to send an OPT to user on registration confirmation: https://github.com/Hamza-Sajid/Smart-Cruiter-FYP/blob/master/Server/Controllers/UserController/Register.js

Kindly look at the code and if you find any error ? let me know in comment section.
Looking forward to hearing from you.
Thanks!