Router is new, first time connected; can connect Samsung phone to wireless but cannot connect anything else.........have two TP link extenders connected to router and showing all systems working; can link wifi on phone to them successfully........unable to connect laptops, roku or any other device (Lutron).  Have updated the firmware on the router. Checked the router to confirm name of network and password, but still cannot connect laptops, etc. Spent many hours trying to find advice on TP Link support site. Any assistance would be gratefully received here.