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QuickBooks will send invoices to customers when they’re set up as recurring transactions or as workflows. Let’s open the Recurring Transactions page to check it.
If you’ve created a workflow for invoices, configure the settings to prevent this from happening again. For detailed instructions, perform Step 3 in this article: Use workflows in QuickBooks Online Advanced to send reminders.
However, if your invoices are not set up to any of the mentioned above, open the Audit Log Report to trace who made some changes to your account.
Check out these articles for additional resources.
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