Hi tashs,
Sorry for the delay in my response. When the option for send to specific customers has been ticked, you will need to go into the card files of the individual customers you want to send the reminders to and select the send invoice reminders to this customer button. Have these been ticked in the customer card files ? If they haven't this would be why those reminders haven't been sending to the customers. Information on how to set this up is available on our help article Setting up invoice reminders.
If they have been set up, please send me a private message with the following details so I can investigate further:
- Serial number
- Screenshot of the customer selling details tab and invoice reminder set up
- Screenshot of an invoice that was sent but reminder hasn't been sent for the customer