Invalid Access Key S3

This error message typically means that you use an AccessKeyId which doesn't exist. Based on the information you have provided, I assume that you're using AccessKeyId and AccessKey directly, i.e. not an IAM role and temporary credentials.

To fix the issue, take the following steps:

• Check how you instantiate your AWS config: Are AccessKeyId, AccessKey and Region correctly set?
• Test the same operation on the CLI (using the same AccessKey): Does it work there?
• Check in the AWS Console if the access key (ID) exists, and that the user has sufficient permissions
• Check if some other code is overwriting your configuration

Note that in general, you should always be careful using AccessKeys directly in code, as this might lead to hard-coded credentials.