@csloisel – that did it! Thanks so much for the assist.
@csloisel I installed the plugin and made sure it was activated.
On the dashboard, path down to Tools > Eventbrite. This brings up a window with some text that says “Authentication Status” with a clickable link saying “Connect with Eventbrite”.
I click on the link and it redirects me to Eventbrite. When I log in to the site, I get the error message listed above: “The application you’re trying to use has made an invalid request to Eventbrite. Please contact the application developer.”
Sounds like your presumption about API is correct, unless I need to somehow enable this on the Eventbrite side first?