I have WHMCS set up in a cPanel and a couple thousand customers loaded, but I need help getting their domains and other services assigned to the customers. Also need help editing the default template in the client login area to show my services appropriately.
I was advised on chat to enable Display Errors via Configuration > System Settings > General Settings > Other Tab and then try again. I did that and it worked, although I have no idea why it worked since no errors appeared. I then turned Display Errors off.
I am having exactly the same "bad username or password" problem BUT I am sure I have coped and pasted the API token correctly. And I surely know my reseller username since I have been an eNom reseller for many years. I'm baffled.