EX6400 won't connect to router (Nighthawk AX3000 RAX35)

I bought an AC1900 Dual Band WiFi Mesh Extender Essentials Edition today to increase the range from our router in the basement. I can get into the nighthawk app when connected to the EX6400 but everything I select my wifi networks from my nighthawk AX3000 it tells me the passwords are incorrect. Internet is fiber through centurylink, but using my own router with PPPOE login through nighthawk. Any ideas?

Edit: I have also tried hardwire from laptop to extender to do the set up that way. Same issue, saying password incorrect. I am using the same password that all of my devices currently connect to internet with.