How to write as symbolic piecewise function with conditions on a symbolic vector

I have a symbolic vector, and I want to define a function that is an parabola if the vector is inside a hyper cube of length 2 centered at the origin, and otherwise it's infinity. This is what I've written

syms Xi [1 n]

ff = piecewise(all(abs(Xi)<=1),sum(Xi.^2),Inf);

This function however produces the error

Error using symengine
Unable to prove 'abs(Xi1) <= 1' literally. Use 'isAlways' to test the statement mathematically.

Error in sym>logicalNaNIsTrue (line 2054)
    X = mupadmex('symobj::logicalNaNIsTrue',A.s,9);

Error in sym/all (line 623)
                X = all(logicalNaNIsTrue(A));

Answer 1

[Walter Roberson]

n = 4

n = 4

syms Xi [1 n]
condition = fold(@and, abs(Xi)<=1)

condition = 

ff = piecewise(condition, sum(Xi.^2), Inf)

ff = 

Answer 2

[Torsten]

n = 2;
Xi = sym('Xi',[1 n]);
ff = piecewise(max(abs(Xi))<=1,sum(Xi.^2),Inf)

ff = 

fsurf(ff)