nvim can't install fzf

[lgprall]

I have fzf installed via homebrew in /opt/homebrew/bin/fzf; I have /opt/homebrew/bin/fzf in my runtimepath.

I have tried:
Plug 'junegunn/fzf'
Plug 'junegunn/fzf', { 'dir': '~/.fzf', 'do': './install -- all' }
Plug 'junegunn/fzf', { 'do': { -> fzf#install() } }

I get no errors when I run PlugInstall, but when I try "PlugInstall fzf" I get "No plugin to install", and when I run PlugStatus, I get
'x fzf: Not found.'

I'm running macOS Monterey 12.1 on an M1 iMac.

Any thoughts?