Ok. I'll put the cuttlebone in the cage for now and start looking for more options. I'll put them calcium on the side from now on.
For a quick option:
Go cook an egg for yourself to eat (from the store, or from any other source).
Break the shell into pieces a quail could swallow (Maybe squish it with a fork or with your fingers. It doesn't have to be perfect.)
Put the eggshell pieces in the quail cage.
Repeat any time they run out.
That will provide one source of calcium, while you figure out what will work best as a long-term solution for you.
With the cuttlebone, it is a big hard piece. They would have to scrape it off or break it off. With broken eggshells, or crushed oystershells, they can swallow one little piece at a time, so it is easy for them to get more of it.
Cuttlebone may work for some kinds of birds: there are different styles of beaks, different amounts of strength, and different calcium needs. A chicken or quail that lays an egg almost every day will have very different calcium needs than a penguin that lays a single egg once a year. Most other birds are somewhere between those extremes.