A few ideas...
One, do not use a query, but look under all devices, do you see it there?
If not add IP to your column set, check by that, Mac's sometimes send back a different "device name" than what you expect.. there is a fix for that if this is your case
If still not seeing it, in the top left section of the console, where you see "devices, queries" etc... expand "Configuration"
Look under "Pending unmanaged client deployments"
Is it there? Not sure why, but sometimes systems end up there... delete it, run an inventory scan from the client again.
Still not there?? Are you scoped?