I have an AV600 kit, (TL-WPA4220) with two extenders.

Everything works fine and I can get a strong signal in the distant reaches of the house.

The problem is I'm trying to log on to the tplinkplclogin.net page so I can change the name and password settings on the extender to match my router. But even though I am connected to the WIFI via the extender it thinks I am connected to the router's signal and won't let me get beyond the warning page. I've checked and double-checked I am connected to the extender.

I've checked this from my MacBook and a windows laptop. Both report the same.

Any ideas anyone?