Does AmfRemotingProvider work? Cannot configure provider: "No url configured"

We are evaluating ExtJS as a front-end to replace a Flex UI. We use AMF for data communication which supposedly is supported in Sencha Complete.

Has anyone got this working? I can't even configure the endpoint. Here is what I'm doing:

Code:

      Ext.direct.Manager.addProvider({
        "url":"/Portal/messagebroker/amf", // URL for the HTTPEndpoint
        "type":"amfremoting",
        "binary":true,
        "endpoint": "my-amf", // the name of the HTTPEndpoint channel as defined in the server's services-config.xml
        "actions":{
        "localeService":[{ // name of the destination as defined in remoting-config.xml on the server
            "name":"findAll", // method name of the method to call
            "len":0 // number of parameters
        }]
        }
        });

When executed I get this in the console:

Code:

[E] Ext.direct.AmfRemotingProvider.connect(): Error initializing RemotingProvider, no url configured.Util.js?_dc=1420219965333:704 logError.js?_dc=1420219965333:186

You can see I'm setting the url in the call to addProvider.

A complete working example would be a great help. I've looked at all the docs on this subject (and the source) and I feel like I'm doing everything correctly.

Any ideas? Thanks in advance.

Does AmfRemotingProvider work? Cannot configure provider: "No url configured"