mkl_get_max_threads() return value unclear

I'm a bit confused about the method

    mkl_get_max_threads()

According to the help documentation, it should return the number of physical cores (provided that dynamic adjustment is enabled).

However, when I run the code below on my 4-core machine, I get back "1" for "nT". How so?

			if ( 1 == mkl_get_dynamic( ) )
			{
				long nT = mkl_get_max_threads();
				mkl_set_num_threads( nT );
			}