Adding users to your JupyterHub instance involves using a Linux command.
  1. Log in to your JupyterHub instance as an administrator user with root access.
  2. Run the following command to add the user to the JuypterHub instance. 
    # Replace <USERNAME> with the users keycloak username
adduser <USERNAME>
If you do not add the user to JupyterHub, they will receive a 500 internal service error message when they attempt to access JupyterHub in the browser.