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Hello there, @katy42.
Good to see you here in QuickBooks Community. Allow me to help and guide you on how to setup Invoice reminder in QuickBooks Online (QBO).
You can manually set up a reminder email each of your customers once their invoices are already in the past due. Let me walk you through the process:
You may also check this article for the other option on how to set up invoice reminders.
If you need further assistance with the steps, I recommend calling our QuickBooks Online Support Team. They have additional tools to pull up your account in a secure environment and do a screen share.
Here's how to contact our support:
That should do it! Please know that I'm just a post away if you have any other concerns about Invoice reminder. Wishing you and your business continued success.