You cannot issue an invoice to both a patient and their partner's emails. This ensures that the invoice is assigned to accountable person, and prevents any potential double payments.
To issue an invoice to a patient's parter's email address, select the patient's partner in the "Issued to" dropdown.
To show both a patient and their partner as the recipients of an issued invoice on the invoice PDF, select the "Include partner on PDF" checkbox in the invoice creation flow. When downloading an invoice, both the patient and their partner will appear next to the "Issued to" field on the PDF.
