> ## Documentation Index
> Fetch the complete documentation index at: https://docs.coreweave.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Authentication

<Card title="API 키에서 'must be 40 characters long' 오류가 발생하는 이유는 무엇인가요?" href="/ko/support/models/articles/why-does-my-api-key-fail-with-must-be-40-characters" arrow="true" horizontal>
  W\&B는 이제 더 긴 API 키(약 86자)를 발급합니다. 이전 wandb SDK 버전은 정확히 40자인지 검증하고 거부합니다 ...
</Card>


## Related topics

- [Introduction to unmanaged authentication](/products/cks/auth-access/unmanaged-auth/introduction.md)