A SysOps administrator is unable to authenticate an AWS CLI call to an AWS serviceWhich...

The most likely reason for being unable to authenticate an AWS CLI call to an AWS service is the absence of an access key. AWS CLI requires an access key and secret key to authenticate requests.

Access Key and Secret Key:

AWS uses access keys to identify and authenticate the identity of the requester.

Ensure that the AWS CLI is configured with a valid access key and secret key.

Check AWS CLI Configuration:

Use the aws configure command to set up the AWS CLI with the necessary credentials.

Verify that the ~/.aws/credentials file contains the correct access key and secret key.

AWS CLI Configuration

Managing Access Keys