The reason why the ice cream powder cannot be whipped is that the temperature is too high, the water is insufficient, and the mixing time is not enough.

1. Too high temperature: Too high water temperature will affect the whipping effect. You can leave the ice cream powder at room temperature for a period of time before whipping it.

2. Insufficient moisture: The whipping of ice cream powder requires the addition of an appropriate amount of water. Insufficient moisture will also affect the whipping effect. You can try adding an appropriate amount of water or milk to stir.

3. Insufficient stirring time: Ice cream powder needs to be stirred until obvious foam appears, and the foam must be uniform and fine. Insufficient stirring time will also affect the whipping effect. You can extend the stirring time appropriately until obvious foam appears.