Hello,
I’m trying to teach the character to dodge, it works in all directions but when I use A+S+Alt (alt for dodge, the rest is movement) it doesn’t even print? Using 2 arrow keys + alt works fine.
Hey @fecreation!
Strange question, by chance are you using a laptop? I know most modern laptops do have a key-character limit, I’m not sure why they do this but that was the first thing that came to mind.
If the arrow keys are working, and WASD are assigned to the same thing (just duplicate keys) there should be no reason the engine would have an issue that I can think of… so my thought is anything outside of the engine possibly stopping it from happening. Alt+A+S isn’t a shortcut that I’m familiar with… 
does it happen with all LETTER/NUMBER keys + alt? If SO look into that “Keystroke Limit” that a lot of windows computers ship with. 
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Seconded. @fecreation Could you head over here:
And see if that particular key combo works? NKRO - n-key rollover is not an issue one needs to deal with often these days but who knows…
Key roll-over was my first guess, and “some system tool wants alt-S or something like it” was the second guess.
Thanks to all. The online key rollover test shows me that if I use the “A” + “Alt” keys and a third key, it doesn’t work. I use a normal PC with a cable keyboard. But A + Alt works, as soon as a 3 key is pressed it no longer works.
It doesnt matter which alt key.
So it is specifically Alt+A? All other keys allow a third button press, such as Alt + S or Alt + Z, but not Alt +A?
Just trying to get the details right!
That being said, what we can deduct from that information is that it doesn’t have anything to do with Unreal. 
yes it is only ALT + A on 2 keyboards
Unfortunately what that means is that it is associated with your Windows installation, likely software associated with your specific computer. Unfortunately, the only thing to say about that is if it’s a problem for you, it’s going to be a problem for your players. The only shortcut in any Microsoft software for Alt + A is opening the “Data” tab in Excel.
For this reason, the only thing left is to suggest using Shift or Ctrl instead. They are much easier to reach by more people’s hands, as well, which is why most game companies forego the use of Alt as a modifier key.