This is not a kata issue.

As stated in the description:

use the standard rounding function of your language of choice

dani is correct, you need to be able to express the number as two different sets of two cubes in order to return true.

I may be reading the text wrong, but the number has to be written as the sum of cubes in two ways. n=a^3+b^3=c^3+d^3, where a,b,c,d are positive and different.

From what you are saying, for 46163 you've only managed to find a pair of numbers that satisfy that condition

Same here. Hardcoded, but still an issue.