Make sure that the router's IP address is correct because most routers use default IP addresses like 192.168.0.1 or 192.168.1.1 to access the admin interface. Are you sure you're connected to the router? You need to be connected to the router either through WiFi or a wired Ethernet connection to access the admin page. https://www.tp-link.com/ph/home-networking/wifi-router/
The first step to logging in as an administrator is to go to the Network and Sharing Center on your PC. This can be found in the Control Panel or under "Network and Internet"
Yes, I too had a problem accessing the router administrator 192.168.l.l - this is the default IP address for most Wi-Fi routers. This universal IP address is used to configure and reset the router if you use a wireless network. People who prefer to use wireless connections in their workplace or home.
Despite having a router administrator address, the login process does not work. I think in these situations you should contact the specialists to help.