How can I send email notifications to secondary emails in Support?
Support only sends emails to the primary email address. The secondary email addresses are used to identify user accounts, but outgoing email ticket updates are only sent to the primary email address.
As a workaround, you can create an Email Target that represents a secondary email address and build the target into your triggers and automations. However, you would need one target per email address, so this may not be practical, except for limited use.