Refactor auth for better readability

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

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

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

The issue does not name files or tests; start by locating the authentication utilities and their existing error handling. Review how errors are currently reported, then confirm that the resulting messages are more descriptive and debugging-oriented without changing the intended authentication behavior.

Written by the indexing model from the issue text.