'Program.Program()': new protected member declared in sealed type

Non-nullable property 'EmailAddress' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'AgentId' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'SenderEmail' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'BaseUrl' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'TokenEndpoint' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'ClientId' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'ClientSecret' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.