My php fetch from an SQL query doesn’t return the ID

My Login Function which Returns the Value $FoundAcc

function Login($Username,$Password){
    global $ConnectingDB;
    $sql = "SELECT admin FROM admin WHERE admin=:admin 
    AND password=:password LIMIT 1";
    $stmt = $ConnectingDB->prepare($sql);
    $stmt->bindValue(':admin',$Username);
    $stmt->bindValue(':password',$Password);
    $stmt->execute();
    $Result = $stmt->rowcount();
    if ($Result==1){
        return $FoundAcc=$stmt->fetch();
    }else{
        return null;
    }
}

My PHP login page should save the fetched Row from my DB and save it in a Session Variable (UserID) but It doesn’t, It Does however save the (Username)variable from the Row… What is wrong?

if(isset($_POST["submit"])){
    $Username=$_POST["username"];
    $Password=$_POST["password"];
   //if username/password are empty show error//
    if(empty($Username)||empty($Password)){
        $_SESSION["ErrorMessage"] = "All Fields Must Be Filled Out!";
        Redirect_to("Login.php");
    }else{
        $FoundAcc=Login($Username,$Password);
        // if account and pw found in DB complete following
        if ($FoundAcc){
            //save variables from DB row to session variables
        $_SESSION["UserID"]=$FoundAcc["id"];
        $_SESSION["Username"]=$FoundAcc["admin"];
            //show toast
        $_SESSION["SuccessMessage"] = $_SESSION["UserID"]." Has Successfully Logged In ";
        Redirect_to("Login.php");
        }else{
            $_SESSION["ErrorMessage"] = "Incorrect Username or Password!";
        Redirect_to("Login.php");
        }
    }
}

Answer

The sql query should be like this:

 $sql = "SELECT * FROM admin WHERE admin=:admin AND password=:password LIMIT 1";