Authentication issues. The request failed because no authorization header provided, an incomplete header (e.g. Bearer without token), no authorization header provided, unsupported authorization method, invalid signature, or an expired token.
| Error Condition | error.message | Description |
|---|
| No Authorization header | No authorization header provided | Authentication header is completely absent. |
| Bad header format | Authorization header format error | Header present but incomplete (e.g. Bearer without the token). |
| Unsupported scheme | Unsupported authorization method | Scheme is not Bearer or Basic. |
| Token failed validation | Error validating token | Token could not be parsed or verified. |
| Token expired / not found | Invalid or expired token | Token is syntactically valid but no longer accepted. |
