Sending keys to the game

[koefficiens]

Hey guys, I just want to make a auto potion and item grabbing system.
I put the potions to the first slot (1) but when i try to send an input it does nothing...
I have tried keybd_event
like this in an infinite while

 keybd_event(0x31, 0, 0, 0);              // press the 1 key
            Sleep(100);
            keybd_event(0x31, 0, KEYEVENTF_KEYUP, 0); // let up the 1 key

And even SendInput but neither works for me... any suggestions? Thanks for the help <3

[Benhero]

Already tried to run the programm as administrator?

Greetings