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When a WHMCS customer tries to create a Virtual Machine, why does the error 'Can't create OnApp User. Login has already been taken. Email has already been taken' occur?
All OnApp versions
Any WHMCS modules
This error can occur when the email address being used to create a VM, through the WHMCS OnApp plug-in, is already present in the OnApp database (e.g. for an active, or even a deleted user). As a workaround, we suggest that you use a different email address so you're able to create the VM or fully delete the user within OnApp if it is not currently in use.