With so little information, it’s hard to tell, but there are a few things that could go wrong:
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Your character could be stuck in the ground or float above the navmesh. Try moving the Player Start up/down a bit to see if it helps.
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If that doesn’t help, drag your character directly in the map. Can you move him that way? What if you place him in a smaller template map?
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Finally, add a Print node after the input events to check if you even get the input events. If you press the button, does your test message get displayed on the screen?