There are a couple of things I can see here. First of all you have the following command:
aaa authentication enable default group radius enable
I assume this is a typo and you mean:
aaa authentication enable default group radius
Secondly, and more importantly, I don’t see any RADIUS server configured in the above configuration. You need something like this, as shown in the lesson:
radius server MY_RADIUS
address ipv4 192.168.1.200 auth-port 1812 acct-port 1813
This will allow the router to query the specific radius server (once it is set up and configured) for authentication. Without this, the device will fail in any attempt to connect via the RADIUS server.
Now having said that, if you already have your RADIUS server set up, then the next step is to look at some of the logs of the RADIUS server to see why login is failing. If you look at those, it will give you a better understanding of where the problem lies. Are requests even reaching the server? If not connectivity must be troubleshot. If they are, then configuration of the server must be the next step.
Take a look at these and let us know your progress. If you have additional questions, we’re here to help you out…
I hope this has been helpful!