Integration Hub can be installed from the SharePoint Store and accessed from your PWA from Site Contents page. In such a case, no additional authentication is required to access the Integration Hub. If you wish to access Integration Hub from the https://online.fluenthub.com/#/login page, you should first create a password for Basic authentication. You can do so by navigating to your Integration Hub environment -> personal settings (right upper-corner) -> Change password -> Create new password.