Check on your network setting. Please make sure that your network Wi-Fi is 2.4G rather than 5G. This might be the main issue that your device is not able to get connected to.
After checking, if your device is still having a hard time getting online. We would highly recommend you to get in touch with our customer support team for further solutions. You could reach them via support@netuve.com or instant message them on netvue.com.