Confirmation email the user received has blank/incorrect value for the confirmation URL. In the notification template the placeholder @@ConfirmationURL@ is used. How to correct the URL?
Set the correct values in the e-mail settings:
Home > System > Settings > Events > Notifications > Security > Email Settings tab
Return Host is the URL of PBA control panel. Email Confirmation Required shall be set to Yes.
Indicate the proper template:
Home > System > Settings > Notifications > Common Notification Settings
Email Confirmation Template
Resend the confirmation notification to the user, the button "Resend Confirmation E-mail" shall be used (not "Send Notification").