Using Wifi as WAN on a network with PEAP security

I just bought a Cradlepoint CTR35 router, which has the capacity to do 'Wifi as WAN'. The network I would like to use as my connection to the internet is protected with PEAP security, requiring both a username and password. I can log into it from a computer or phone, but I can't figure out how to log into it on the CTR35. The device seems only to be able to log into networks with WEP or WPA security.

I was wondering whether there might be a step I'm missing, or other software I could install on the router that would allow me to use the PEAP network as my source network, and rebroadcast it as a local network.

Thanks so much!