I have a new RE550 AC1900 Range Extender that I've configured and changed the networks name to have suffixes of APT instead of EXT to identify it differently than others. The extender is online and I can connect to both 2.4 and 5.0 networks but the Tether app now shows "Unknown Device" and says to connect to https://tplinkextender.net. When I try that both on my laptop and iOS devices, it takes me to spam pages; not to the extender login.  I have several Tp-link extenders and am trying to isolate ip ranges.