Password policies are, in part, used to enforce password complexity requirements. IAM password policies can be used to ensure password are comprised of different character sets. It is recommended that the password policy require at least one uppercase letter.
Perform the following to set the password policy as prescribed:
aws iam update-account-password-policy –require-uppercase-characters
Note: All commands starting with “aws iam update-account-password-policy” can be
combined into a single command.