Add configuration options for notifications

**Problem**
When working with core, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

No files, tests, or entry points are named. Start by locating the core error-handling and notification configuration paths, then clarify which configuration options and error messages are required; done means the requested options work and the resulting errors are more descriptive.

Written by the indexing model from the issue text.