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Good day, earthexpressions.
QuickBooks Online has an automated invoice reminder feature. Once you turn this on, this will send reminders or notices to your clients regarding invoices that are or soon to be overdue.
Please follow these steps if you want to stop this feature.
I have an article here for more details: Automate invoice reminders in QuickBooks Online.
I'll be here if you need anything else. Wishing you all the best!