Hello fellow Engineer. It look like you haven't configured your pyenv correctly. Please note that pyenv will be enable only for the user you installed pyenv, thus your configuration must be enabled in your ".bashrc" (in case of bash) or ".zshrc" (in case you're using zsh as the default shell);

Look at this snippet for reference: https://gist.github.com/joepreludian/4a2b21914378d39daacdc5fa63dcc97a

In case of recurring problem, please let me know.