There is no question that entering the incorrect login information for a Wavlink device or any of the other components of the setup process can result in issues. In addition, you might not be aware of that; so, make sure you check the manual guide that came with the extender in order to obtain these specifics. In any event, if you start having errors in the configuration of the extender, then you should apply these recommendations for troubleshooting the Wavlink AX1800 setup. 

During the process, the placement of the extender needs to be checked, and it needs to be closer to the existing router. Make certain that the extender, the router, and the device all have a solid connection to one another. In addition, before beginning the process of setting up, ensure that you have all of the necessary components on hand and ready to go. During the process of setting up the device, the login information and any other credentials that you will use must be correct.