A new business reminder default does not enroll all older invoices.

1. Check the invoice’s own choices

Open the older invoice and review Options → Reminder Option. Check whether a reminder is selected on that invoice.

Check reminder choices on the actual invoice.
Check reminder choices on the actual invoice.

2. Compare the business default

Open Business Profiles → Edit → Reminders. Enable makes a schedule available; Default selects it for new invoices. Existing invoices keep their own choices.

Enable and Default have different effects.
Enable and Default have different effects.

3. Review eligibility

Check the document is issued, unpaid, and due for the selected reminder. Review customer opt-out, the recipient, and any delivery restriction shown.

4. Review history before a follow-up

Look in the invoice’s History. If a previous attempt is uncertain, request support review before sending again. Enabling a schedule does not send a historical backlog.