Unable to configure used/existing users in SolusVM 2 to be able to register in WHMCS as well.

Symptoms 

Unable to configure used/existing users in SoluSVM 2 to be able to register in WHMCS as well.

Cause

SVM2-46 - Unable to register a new account in WHMCS with prepaid module for SolusVM 2 in case there is a user with the same email address in SolusVM 2
 

Resolution 

Update your Solus WHMCS module and SolusVM 2 to the latest version.

https://support.solusvm.com/hc/en-us/articles/13266273737879-How-to-update-SolusVM-2-provisioning-module-for-WHMCS

https://support.solusvm.com/hc/en-us/articles/13266446486039-How-to-update-SolusVM-2