I found the problem and now is working. Hope this helps others. Found the 5g on my router set to manual channels. Changed to 40. After saving my settings to verizon router 5g light came on Re300 and...

I have a RE300 range extender. Configured 2.4 OK. Can not get 5 to configure. I have a Verizon router. Only way I could get 2.4 to work is using the WPS method. But, it still would not configure 5g....