Here is the form setup for allowing users to change their account password:

                        <div class="signup-form-small">
                            <form method="post" name="frmPassword" id="frmPassword" class="needs-validation" novalidate>
                                <div class="form-group">
                                    <div class="col form-floating">
                                        <input type="password" class="form-control" id="curpwd" name="curpwd" required>
                                        <label class="form-label" for="curpwd">Your Current Password</label>
                                    </div>
                                </div>
                                <div class="form-group">
                                    <div class="col form-floating">
                                        <input type="password" class="form-control" id="newpwd" name="newpwd" required>
                                        <label class="form-label" for="newpwd">Enter New Password</label>
                                    </div>
                                </div>
                                <div class="row form-group">
                                    <div class="col form-floating">
                                        <input type="password" class="form-control" id="cnfpwd" name="cnfpwd" required>
                                        <label class="form-label" for="cnfpwd">Confirm New Password</label>
                                    </div>
                                </div>
                                <div class="form-group">
                                    <button type="submit" id="btnPwdSubmit" name="btnPwdSubmit" class="btn btn-primary btn-lg btn-block w-100 has-spinner">
                                        <div class="spinner-border float-right hidden" id="pwdspinner" role="status"></div>
                                        Change My Password
                                    </button>
                                </div>
                            </form>
                        </div>

The script block below should handle validation for the form:

        $(document).ready(function () {
            'use strict';
            window.addEventListener('load', function () {
                var forms = document.getElementsByClassName('needs-validation');
                var validation = Array.prototype.filter.call(forms, function (form) {
                    form.addEventListener('submit', function (event) {
                        if (form.checkValidity() === false) {
                            event.preventDefault();
                            event.stopPropagation();
                        }
                        form.classList.add('was-validated');
                    }, false);
                });
            }, false);

        });

Here is the script code that runs when the user clicks the 'Change My Password' button in the form:

            $('#frmPassword').submit(function (event) {
                event.preventDefault();

                setPwdDisabled();

                var obj = Object.fromEntries(new FormData(event.target));
                if (obj.Is_Body_HTML == 1) {
                    obj.Is_Body_HTML = true;
                }
                else {
                    obj.Is_Body_HTML = false;
                }
                if (obj.Is_Active == 1) {
                    obj.Is_Active = true;
                }
                else {
                    obj.Is_Active = false;
                }

                if ($('#curpwd').val() != $('#cnfpwd').val()) {
                    $('toastPwd').toast('show)');
                    return;
                }
                var json = JSON.stringify(obj);

                var request = $.ajax({
                    url: "../handlers/changepwd.ashx",
                    method: "POST",
                    data: json,
                    dataType: "json"
                });

                request.done(function (msg) {
                    if (msg.Success == false) {
                        $('#spnPwdErr').html(msg.Status);
                        $('#toastPwdFail').toast('show');
                    }
                    else
                        $('#toastPwdSuccess').toast('show');
                });

                request.fail(function (jqXHR, textStatus) {
                    $('#spnPwdErr').html('Unable to complete your request at this time.');
                    $('#toastPwdFail').toast('show');
                });

                request.always(function (jqXHROrData, textStatus, jqXHROrErrorThrown) {
                    setPwdEnabled();
                });
            });

However, despite the setup, the form validation does not work and the submission happens anyway. No errors or messages are shown in the console. Can anyone provide insight into why this is happening?