Blazor UI: Authentication
The application startup template is properly configured to use OpenId Connect to authenticate the user;
- When the Blazor application needs to authenticate, it is redirected to the server side.
 - Users can enter username & password to login if they already have an account. If not, they can use the register form to create a new user. They can also use forgot password and other features. The server side uses OpenIddict to handle the authentication.
 - Finally, they are redirected back to the Blazor application to complete the login process.
 
This is a typical and recommended approach to implement authentication in Single-Page Applications. The client side configuration is done in the startup template, so you can change it.
See the Blazor Security document to understand and customize the authentication process.