It should be working. I guess you don't have enough SP. If I remember correctly, it is about ~ 5000 SP needed to be able to claim an account with RC.

I keep getting a message saying that steem returned no error message, but nothing else happens.

You mean a message stating something like 'Steem KeyChain did not return any error message'? Then it is related to the KeyChain extension and the message from the node is not correctly returned by it.