My range extenders are not connecting to wifi.  I have tried resetting both the router and the extenders.  The extenders light up but the wifi light does not come on.  I have tp-link cameras connected to the extenders.  They are picking up a wifi signal but still are saying 'waiting for wifi to connect'.  I have also reset the cameras.

The connection may have failed in late December as that is the last time the security cameras show any activity.    I really don't know what the problem is.  Any suggestions?

BTW I attempted to connect via the website but it failed. So I've been trying to do the set up thru the Tether app.

Thanks for any help.