On chrome I'm encountering a CORS error when trying to retrieve the GraphiQL plugin. This was working just a week or so ago since posting this.

Access to script at 'https://unpkg.com/@graphiql/plugin-explorer@5.1.1/dist/index.umd.js' (redirected from 'https://unpkg.com/@graphiql/plugin-explorer/dist/index.umd.js') from origin 'https://gem-services-api.prod.target.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.