@Welshmark 

Hi,

If you "ping" the two hostnames (i.e. ping whatever.tplinkdns.com, ping my-no-id-hostname) you should get in return the IP addresses that are currently assigned to these hostnames. (if you don't have a computer you can also use some app on your phone or use the AX20's own ping feature under "Advanced" > "System" > "Diagnostics")

Looking at those IP addresses in comparison might give you a clue what is going on.

Especially check that the addresses are public IPv4 addresses and that they match the IPv4 address of your Internet connection.

  @woozle It seems the problem may be my android phone. I tried using my laptop (Linux) tethered to the phone and all works fine. It just wont work on android itself. Pinging as you suggested using the diagnostics gave the same IP addresses.

I have everything working fine with VPN, maybe the problem is on the network?