Satellite won't connect MR90

I got my system MR90 router with 2 satellites (MS90) all hooked up and running. I wanted to add 1 more satellite (MS90) to the system. When I power the new one on it has the flashing white light and then it goes to solid amber. No matter how many times I run the "add satellite" process in the app it's never found. I read on here to hardwire it to the router and I did that and same thing happens. I don't know what else to do. Please help.