Q.What did I do wrong?
I was given an amaryllis bulb and followed the instructions to the letter, but the thing never bloomed.
The amaryllis bulb should be planted so the neck is exposed above the soil line. An amaryllis bulb that is planted too deep may not produce a flower stalk.
Amaryllis bulbs prefer a moist, rich soil. But if the soil has too much nitrogen, it may not produce flowers.
When an amaryllis starts growing, it needs bright light.
Overly moist soil causes the bulb to rot. It is important to keep the soil moist but not soggy.
And it could be out of your control with an immature bulb or a bulb that was not stored in the correct manner.
I know it's frustrating, but don't give up! Order a new bulb from a reputable grower; and try again!
https://www.gardeningknowhow.com/ornamental/bulbs/amaryllis-hippeastrum/no-flowers-on-amaryllis.htm