help deploying appengine app to custom domain

Question

I'm having problems deploying a test app to my google apps domain. I know I'm missing something -- any kind souls out there see it?

1. sign into appengine.google.com/a/mydomain.com
2. create application, my-app-id
3. verify that app.yaml has the same app id, my-app-id
4. visit dashboard and add my domain

5. from shell on local pc,

   set AUTH_DOMAIN=mydomain.com
python2.5 appfcg.py [email protected] update myappdir/
   

Error from server:

Application: my-app-id; version: 1.
Server: appengine.google.com.
Scanning files on local disk.
Initiating update.
Error 403: --- begin server output ---
You do not have permission to modify this app (app_id=u'my-app-id').
--- end server output ---

And I see that the Server is set to google.com, but no idea how I should change this.