在AWS负载均衡器中设置重定向规则，以便将请求重定向到Auth0登录页面。以下是一个示例Lambda函数，可以帮助您完成这个任务：

exports.handler = async (event) => {
    const request = event.Records[0].cf.request;
    const headers = request.headers;

    // If the request path is already the Auth0 login page, return the request
    if (request.uri === '/login') {
        return request;
    }

    // If the request path is a protected path, redirect to the Auth0 login page
    if (request.uri.startsWith('/protected/')) {
        const newUrl = `https://${process.env.AUTH0_DOMAIN}/authorize?client_id=${process.env.AUTH0_CLIENT_ID}&response_type=code&scope=openid email&redirect_uri=${process.env.AUTH0_REDIRECT_URI}&state=${request.uri}`;
        return {
            status: '302',
            statusDescription: 'Found',
            headers: {
                location: [{ key: 'Location', value: newUrl }]
            }
        };
    }

    // Return the request for all other paths
    return request;
};

在上面的代码示例中，任何请求到来时，Lambda函数将触发并根据请求路径重定向到Auth0登录页面。您需要将此Lambda函数绑定到AWS负载均衡器的事件上。