Why is my string not matching my vector C++?

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C++

I'm compiling my code, no errors. then I run it and get this.

> ./main.o
Welcome.
Please enter your username.
penlands
your user is not in the users file.

Here's the code.

#include <stdlib.h>
#include <iostream>
#include <vector>
#include <string>

int main() {

std::vector<std::string> users = {"teagan, penlands"};
std::string loginUser;
char* mySecret = getenv("tPassword");

  std::cout << "Welcome.\n";
  std::cout << "Please enter your username.\n";
  std::cin >> loginUser;

  if(loginUser == users[0] || loginUser == users[1]){
std::cout << "What is the password\n";
  }else{
    std::cout << "your user is not in the users file.\n";
  }
}

Does anybody know why this is happening?

What I have tried:

I have checked the code, can't find anything wrong. IDK why it's not working.