How can I make optimization variables binary while using prob2struct?

Hello,

I am solving a quadratic maximization problem, where I have created a matrix of binary variables x with 6 rows and 10 columns using the statement:

x=optimvar('x',6,10,'type','integer','LowerBound',0,'UpperBound',1);

Once my problem has been defined with all of the constraints and the objective function, I had to solve it, for which I used:

problem=prob2struct(prob_1);

[x,fvar]=quadprog(problem);

I had defined prob_1 as the name of the optimization problem that I am solving.

Although the program does not give out any errors or warnings, the solution for the variables that Matlab is giving me is not binary: it is respecting the upper and lower bound that I had set for my program, but it does not read the 'type','integer'part, and I do not understand why.

What could I do to ensure that Matlab gives out an integer solution to this problem?

Thx!!