Site url in welcome email is main domain instead of user actual site

I am using the WHMCS Provisioning. The welcome email the user gets with user name and pass from WOrdpress gives them the main domain /wp-admin url to login instead of the subdomain they made up.

So they get the screen you do not have sufficient privlages to access this dashboard.

How can you make WP send the correct url so they don't get this error?