My guess is that there was only one ticket available, EDIT: or the inventory on the app and live in the system wasn't synced, someone may have taken one of the available seats. I haven't been blocked from taking the last spot for a CP booking, even if it was BS or AT in the past. Depending on your tolerance for risk, you can cancel the companion and rebook your own BS ticket. (Refuknd and rebook to maintain refundability.) Then keep trying to add the companion back as the flight approaches. Often there is a little movement for availabiliy the day or two before a flight, but you'll need to keep checking back regularly. If no dice, cancel and rebook your ticket for the original flight if plenty of seats are open on that one. A little risky though with a chance to end up without either flight. Edit: if you try this online, you'll have to cancel the companion and cancel/rebook, in order to change both tickets simultaneously you have to call.
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