Add configuration options for serialization

**Problem**
When working with auth, 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 names no files, tests, or entry points. Start by locating the authentication, serialization, and error-handling code, then clarify which configuration options and message details are required; done should include defined behavior and tests for the resulting errors.

Written by the indexing model from the issue text.