zsh: conda environment name auto-completion not working even after installing conda-zsh-completion

I'm trying to set up auto-completion for conda environment names in zsh on WSL. I've followed these steps: 1. Cloned conda-zsh-completion:

mkdir -p ~/zsh-plugins
   cd ~/zsh-plugins
   git clone https://github.com/conda-incubator/conda-zsh-completion 

2. Added to my ~/.zshrc:

plugins+=(conda-zsh-completion)
   autoload -U compinit && compinit

   # conda-zsh-completion
   if [ $commands[conda] ]; then
     eval "$(conda shell.zsh hook)"
   fi

3. Sourced ~/.zshrc However, auto-completion for conda environment names still doesn't work. For example, when I type conda activate x and press Tab, it doesn't auto-complete to xyj_env, even though that's the only environment starting with 'x'. When I source ~/.zshrc, I get this error:

compinit:503: no such file or directory: /usr/share/zsh/vendor-completions/_docker

But I believe this is unrelated to the conda completion issue. How can I get conda environment name auto-completion working in zsh?