Handle edge cases in notifications

**Problem**
When working with components, 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 file, test, or entry point is named in the issue. Start by locating the component notification and error-handling paths, then clarify which edge cases and message details are required; done means those cases produce agreed, more descriptive errors with corresponding coverage.

Written by the indexing model from the issue text.