Using matlab to solve system of algebraic equations, got no answers

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I used the following matlab code to solve a system of algebraic equations, but I got no answer.

clear; clc; close all;

syms x y z u

eqns = [2x + 1 == 2ux, 4y == 2uy, 6z == 2u*z, x^2 + y^2 +z^2 == 1];

S = solve(eqns,[x y z u]);

S.u

the result says:

ans =

But there should be answers, to see the answers, please refer to an MIT calculus course:

So , what is wrong?

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