I am using the AWS-SDK to upload images to S3 from my Express server. After the server reloads, the first request always gives a Signature does not match error, but then works as expected for subsequent requests.

Does anyone have any ideas of what could be going wrong? If it helps, I am using an IAM role to authenticate with AWS, configured by the environment variables AWS_ROLE_ARN and AWS_WEB_IDENTITY_TOKEN_FILE. Thanks in advance!