Invalid endpoint on aws s3 ls

You could also fix this by setting environment variables in your current session for AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, and AWS_DEFAULT_REGION.

(in this case your error is actually caused by the CLI not finding a value for the region)

I think that's not because of the region because you have already set default to us-east-1 as shown by your /.aws/config file but your output type is not set and double check your access key id and secret access key

it should be like:

also check whether you are able to call other AWS API services such as try to create a dynamodb table using AWS CLI and check whether your IAM user have access permissions to s3 or not.