I have implemented the firebase authentication using google and using email and password but the issue is the user can just type in the email that just does not exist. So how can i make sure that the email exists using firebase in android. In kotlin

I’m implementing phone number authentication in my Android app using Firebase. I’m able to initiate the verification process, and the onCodeSent() callback is triggered in my UserRepositoryImpl class, but the SMS message with the OTP never arrives on the device.