The app that you use to test the installation depends on if you performed a non-production or production installation.
For production installations, use the apps that you've developed to verify whether the Server was correctly installed.
For non-production installations, use Tutorial Web App to test the installation. Tutorial Web App is automatically configured during installation to work with your Server. If you run into problems, check Troubleshoot Your App and Troubleshoot the Server for common errors.
Using Tutorial Web app to test
Tutorial Web App is only deployed in non-production installations. To run Tutorial Web App and use FIDO2 authenticators, launch a FIDO2-enabled browser and navigate to https://<your domain>:8443/gwtutorial. For instructions on how to perform FIDO2 operations with Tutorial Web App, see Tutorial App.