This plugin looks like just what I need for REST authentication but when I activate it I get an internal server error for any REST calls. Running WordPress 5.3.
lappy:~$ curl -X OPTIONS -i https://www.greensightag.com/wp-json/
HTTP/1.1 500 Internal Server Error
Cache-Control: no-cache, must-revalidate, max-age=0
Content-Type: text/html; charset=UTF-8
Date: Tue, 26 Nov 2019 23:50:04 GMT
Expires: Wed, 11 Jan 1984 05:00:00 GMT
Server: Apache
X-Frame-Options: SAMEORIGIN
X-Powered-By: PHP/7.0.28
Content-Length: 2836
Connection: keep-alive
<!DOCTYPE html>
<html xmlns=”http://www.w3.org/1999/xhtml” lang=”en-US”>
<head>
<met