Do not use hyphens or underscores in usernames!!

When creating domains that have hyphens, make sure to remove the hyphen from the username, before creating the account within your whm.

Account usernames with hyphens and underscores "_" will cause issues with your accounts (mostly with MySQL and phpmyadmin).

To avoid problems and us having to delete your account in order to rectify a user name problem, please don't use _ or - in your account user names.

Remember, please do not use WHM to change user names of existing accounts, as this will usually lead to having the account removed to rectify problems also.

More here:

As per this
Never Use WHM to modify an account user name
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