Total networking rookie here, please excuse the probably silly question...

I am trying to setup/configure my TL-R600VPN to load balance across 3 WANs. I have all 3 as always on, but WANs 2 and 3 won't connect (they are detected as online from Online Detection but in system status their connection status is "Link Down"). I have the default factory settings still in place. All 3 are set to "always on" and all 3 are set to "dynamic IP"

I currently have no link backup in place, load balancing is enabled, and bandwidth based balance routing enabled on all 3.

Do I need to do any special or manual network/IP configuration on my TL-R600VPN or any of the 3 DSL routers for this setup to work?