You have two TL-PA411. Now let us configure them one by one. You connect your laptop to the first TL-PA411, and use the TP-LINK utility to reset your TL-PA411. Then set a new network name for this...

Strange things. Maybe you can give a try to set a new SSID for your WPA4220.

You don't need to set any security because powerline communication is secured by default.

There is nothing to be worried about. I have asked TP-LINK before why there is 11Mbps, and they have responded that 11Mbps is just a mistake of the TP-LINK utility. In other words, 11Mbps doesn't...

Maybe you can give a try to upgrade your WPA4220's firmware. Here is the download link of the latest firmware for WPA4220：...

Are you sure about this problem? I can't believe TP-LINK's products can't be working together!