As @ATG says, it means your cabin hasn't been officially assigned.
However, since you're seeing a deck and a muster station, it has almost certainly been unofficially assigned and you can use the "barcode trick" to find out what it is.
If you are an Apple user, download your seapass to your Apple wallet.
If you use Android, use a scanner app to scan the barcode.
In both cases, if you see a number after the hyphen, that's your cabin.
Bear in mind that it doesn't become official until you see it on your booking and it could still change, although this would be very unlikely.