Please add more info about your system as detailed in https://retropie.org.uk/forum/topic/3/read-this-first. Are you using the Libretro core or the standalone Vice emulator ?

@joyrider3774
This is a great guide. A pi-based bartop cabinet build is in my not-too-distant future, and this post will be key (no pun intended!) to getting Amiga emulation properly set up and interfaced with a keyboard encoder. Thanks for taking the time to write up and share this detailed guide!
-Dave