When the AWS CLI runs a command, it sends an encrypted request to the AWS servers to perform the appropriate AWS service operations. Your credentials (the ACCESS key and secret key) are involved in the encryption and enable AWS to authenticate the person making the request. There are several things that can interfere with the correct operation of this process, as follows.
https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-troubleshooting.html
Signature Version 4 is the process to add authentication information to AWS requests sent by HTTP. For security, most requests to AWS must be signed with an access key, which consists of an access key ID and secret access key. These two keys are commonly referred to as your security credentials. For information about how to obtain credentials for your account, see Understanding and getting your credentials.
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