The auth is not working in .net core web api?

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The "auth is not working" issue in .NET Core Web API can be caused by various reasons. Here are some possible solutions:

Make sure the authentication middleware is added to your application's pipeline. In the Startup.cs file, add the following code inside the ConfigureServices method:
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services.AddAuthentication(options =>
{
    options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddJwtBearer(options =>
{
    options.Authority = "https://yourdomain.auth0.com/";
    options.Audience = "your-audience";
});
Ensure that the authentication middleware is added to the application pipeline in the Configure method of Startup.cs:
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app.UseAuthentication();
app.UseAuthorization();
Check that the authentication token is being passed in the correct format. For example, if using JWT, ensure that the token is being passed in the "Authorization" header with the "Bearer " prefix.

Check the configuration settings for the authentication provider you are using, such as Auth0, Azure AD, or IdentityServer. Make sure that the settings are correct and up-to-date.

Ensure that the user's identity is being set correctly by checking the HttpContext.User.Identity property. If the identity is not set, the authentication process may not have succeeded.

Make sure that the user's roles and claims are being set correctly. If the roles and claims are not set, the authorization process may not work as expected.

Check that the authentication middleware is being used in the correct order. The middleware order can affect how the authentication process works.

If these steps do not resolve the issue, you may need to provide more information about your specific situation in order to receive more targeted help.