The Margin button does not appear

The widget runs only on origins listed in the project. Compare the address in your browser, including https, subdomain and port, with the list in the project settings, and add the staging or preview origin if it is missing.

Copy the script again from Website widget and compare data-project. A project ID from another website, or a placeholder, loads nothing.

The reviewer-only loader fetches nothing for ordinary visitors. Open the site with Open website from the dashboard once, or reload with the margin parameter the dashboard adds.

It belongs before the closing body tag, or in a tag manager that fires on all pageviews. Open the browser's network panel and look for widget.js.

If your site sends a Content-Security-Policy, allow https://app.margin-comments.com for scripts, images and connections. A blocked request shows up in the browser console.