My name is Darragh, one of the Technical Support Engineers at Airship. Thank you kindly for contacting our support forums.
There is currently no Channels assigned to the above named_user and so there is no device to target when attempting to send a push notification - you can only target users that have an associated device.
Please let me know if you have any questions.
Technical Support Engineer
Portland | San Francisco | London | Paris | New York | New Delhi