Role Authentication

You can refer below examples

https://jasonwatmore.com/post/2022/02/18/net-6-role-based-authorization-tutorial-with-example-api

https://docs.microsoft.com/en-us/aspnet/core/security/authorization/roles?view=aspnetcore-6.0

Please have a look on below repo if its useful for you:-

https://github.com/TypecastException/AspNetGroupBasedPermissions

Do you have the source code of the above link?

https://www.c-sharpcorner.com/article/asp-net-core-mvc-authentication-and-role-based-authorization-with-asp-net-core/