caddy: Can't server any PHP content

OS 10.14.6

Removed all hombrew php installs

Installed php 7.4 via homebrew

❯ /usr/local/sbin/php-fpm -v
PHP 7.4.4 (fpm-fcgi) (built: Mar 19 2020 20:12:43)
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
    with Zend OPcache v7.4.4, Copyright (c), by Zend Technologies

Testing via caddyfile:

❯ cat caddyfile
:8000 {
    root * /Users/xxxx/support/xxxx/website/xxxx_dev01
    php_fastcgi 127.0.0.1:9000
    file_server
}

I get static HTML rendered but no PHP content.

php-fpm is running and listening on port 9000

❯ nc -vz 127.0.0.1 9000
found 0 associations
found 1 connections:
     1:	flags=82<CONNECTED,PREFERRED>
	outif lo0
	src 127.0.0.1 port 59367
	dst 127.0.0.1 port 9000
	rank info not available
	TCP aux info available

Connection to 127.0.0.1 port 9000 [tcp/cslistener] succeeded!