Help with enqueue_and_echo_commands_P (no replies)

I'm trying to write a code to select an extruder like bellow:

int16_t lcd_filament_change_extruder; // I get this from user input on menu and them


_lcd_user_gcode(PSTR("T" STRINGIFY(lcd_filament_change_extruder) "\n")); // all I get is a: Tlcd_filament_change_extruder out instead of a T0\n (or T1, T2, Tnumber).

What should I do ?

Thank you