General
AWS request signature does not match
SignatureDoesNotMatch
AWS rejected the signed request because the signature calculated by AWS does not match the signature sent by the client.
Error AtlasError Documentation and ResolutionObserved message
SignatureDoesNotMatch
Why it happens
- The request was signed with the wrong credentials, region, or service name.
- Headers, query parameters, or body content changed after signing.
- Clock skew or custom signing logic caused the computed signature to diverge.
How to fix it
- Use the official AWS SDK signing path where possible.
- Check the signing region, service name, credentials, and canonical request inputs.
- Ensure the request is not modified after it has been signed.
Official reference
AWS Support API Reference: Common ErrorsRelated errors
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