There’s a general method of debugging IR Remotes in the KB: IR Remotes
Essentially you watch the serial port after you’ve configured WLED’s IR GPIO and press buttons on your keypad. You should see various codes appear corresponding to the IR keys you press. These are what gets decoded by WLED to perform various functions.
Step 1 will be to make sure WLED is reading anything at all from your IR remote.
Then you can try and make sure it does something useful with that code.