Having problems with matching the password with database in php and mysql

My connection with database is okay and I’m also getting correct data from the MySQL server. But, when I verify the password and login, then the password that input doesn’t match with the database. The problem seems to appear when I try to match the input password with the database password.

Here is my code:

<?php require 'connection.php'; ?>

<?php

//login user

if (isset($_POST['login'])) {
    
    $emailUsername = $_POST['email_username'];
    $pass = $_POST['password'];


    $sql = "SELECT * from `users` WHERE `username` = '$emailUsername' OR `email` = '$emailUsername'";
    $result = mysqli_query($conn, $sql);

    if ($result) {
        if (mysqli_num_rows($result)  == 1) {

            $fetchedResult = mysqli_fetch_assoc($result);
            
            if (password_Verify($pass, $fetchedResult['password'])){
                echo "Logged in!";
            } else {
                
                echo "Incorrect password!<br>";
                }
            }

        } else {
            echo "Incorrect username or password!";
        }
    }
}

//Register user

if (isset($_POST['register'])) {

    $name = $_POST['fullname'];
    $username = $_POST['username'];
    $email = $_POST['email'];
    $password = $_POST['password'];

   $sql = "SELECT * FROM `users` WHERE `username` = '$username' OR `email` = '$email'";
   
   $result = mysqli_query($conn, $sql);
   

   if (mysqli_num_rows($result) >0){
    $fetchedResult = mysqli_fetch_assoc($result);
    if ($fetchedResult['username'] == $username){
        echo "username already exists!";
        header("Location: index.php?error=userexists");
        exit();
    } else{
        echo "email already exists";
        header("Location: index.php?error=emailexists");
        exit();
    }
   } else {
    $pass = password_hash($password, PASSWORD_BCRYPT);
    $sql = "INSERT INTO users(`name`, `username`, `email`, `password`) VALUES ('$name', '$username', '$email', '$pass')";
    if (mysqli_query($conn, $sql)){
        echo "User registered successfully!<br>";
        echo $pass;
    } else {
        echo "Can't run query";
    }
   }

}

?>

<?php
  require 'connection.php';
?>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>User - Login and Register</title>
  <link rel="stylesheet" href="style.css">
</head>
<body>
  
  <header>
    <h2>TJ WEBDEV</h2>
    <nav>
      <a href="#">HOME</a>
      <a href="#">BLOG</a>
      <a href="#">CONTACT</a>
      <a href="#">ABOUT</a>
    </nav>
    <div class='sign-in-up'>
      <button type='button' onclick="popup('login-popup')">LOGIN</button>
      <button type='button' onclick="popup('register-popup')">REGISTER</button>
    </div>
  </header>

  <!-- login form -->

  <div class="popup-container" id="login-popup">
    <div class="popup">
      <form method="POST">
        <h2>
          <span>USER LOGIN</span>
          <button type="reset" onclick="popup('login-popup')">X</button>
        </h2>
        <input type="text" placeholder="E-mail or Username" name="email_username">
        <input type="password" placeholder="Password" name="password">
        <button type="submit" class="login-btn" name="login">LOGIN</button>
      </form>
    </div>
  </div>

  <!-- registration form -->

  <div class="popup-container" id="register-popup">
    <div class="register popup">
      <form method="POST">
        <h2>
          <span>USER REGISTER</span>
          <button type="reset" onclick="popup('register-popup')">X</button>
        </h2>
        <input type="text" placeholder="Full Name" name="fullname">
        <input type="text" placeholder="Username" name="username">
        <input type="email" placeholder="E-mail" name="email">
        <input type="password" placeholder="Password" name="password">
        <button type="submit" class="register-btn" name="register">REGISTER</button>
      </form>
    </div>
  </div>

  <script>
    function popup(popup_name)
    {
      get_popup=document.getElementById(popup_name);
      if(get_popup.style.display=="flex")
      {
        get_popup.style.display="none";
      }
      else
      {
        get_popup.style.display="flex";
      }
    }
  </script>

</body>
</html>

I have tried the same code but I didn’t take the password from MySQL server, I typed the data manually in the code and encrypted it then it worked. The only occurs when I try to match the password with the database.