The ethernet cable connected to the TP-link shows a stable connection then turns off and says no internet is available before turning back on a second later.

The ethernet light is constantly blinking and I have tried switching my cables and replugging the TP links but the ethernet light still flickers.

First time trying to set up the TP-link and I am unsure of what else to do.

Little brother unboxed the tp link and threw away the packaging before I arrived home so I am unable to provide more details.