list accounts > one account not listed

Hi there,

Sometimes when pushing security updates we need to expand the list of reserved usernames prohibited for account creation which may explain the issue you are describing. If the account name is listed in either /etc/aliases or /etc/localaliases, you can either remove the alias from /etc/aliases or /etc/localaliases, or rename the account using the WHM API to a username not listed in /etc/aliases or /etc/localaliases:
WHM API 1 Functions - modifyacct - Software Development Kit - cPanel Documentation

E.g.

Code:

# whmapi1 modifyacct user=sales newuser=sales1