Cannot use fc swagger-ui because <Authorize> button is missing.

I have built and deployed the FC according to the fc-service/docker/README.md. Calling localhost:8081/swagger-ui/index.html from the browser displays the swagger-ui but without the "Authorize" button which is shown in the swagger-ui documentation view of fc_openapi.yaml. Thus there is no opportunity to put the authorization parameters. Calling the methods returns error 401 because the Bearer token is missing.