How many liters of hydrogen gas is produced per gram of aluminium?
Your work is correct.  I have to assume that this is being graded by a computer, so trivial differences between your answer and the answer that it is expecting matter.

Possible source of error 1: Ideal Gas Law

Instead of using $22.4\ \mathrm{L/mol}$ they may have been expecting you to use the ideal gas law.
$$PV = nRT$$
$$101.3\ \mathrm{kPa}\times V = 0.05559\ \mathrm{mol} \times 8.314\ \mathrm{J\ mol^{-1}\ K^{-1}} \times 273.15\ \mathrm K$$
$$V = 1.246\ \mathrm L$$

Possible source of error 2: Units

The computer may be looking for units in liters per gram of aluminum, something like:

$$\frac{\mathrm L}{\mathrm g} \ \text{or}\ \frac{\mathrm L}{\mathrm g\ \ce{Al}}$$

I doubt that this is the case, but it's possible.

Possible source of error 3: Typo

Either you or the person who set up the quiz made a mistake and typed in the answer incorrectly.