SigV4 requests fail from one client with a signing-time error, while the same credentials work elsewhere. Which client condition should be checked?

1. Increase only the client retry count while leaving the invalid signing timestamp unchanged.
2. Publish the secret key in logs so the server can compare it manually.
3. Verify the client clock is synchronized and that endpoint, Region, and signing configuration are correct.
4. Assume an IAM allow can override every malformed signature.