Troublshooting - The steps below will guide you through how to move the invoice to the proper customer using QBO.
In your QBO account, go to the Sales menu.
Choose the Invoices tab.
Select the transaction you want to transfer and click the Edit invoice button.
Under the Customer dropdown menu, change the name to which you want to transfer the invoice.
Lastly, click Save.
Once done, you can send this to your client. Otherwise, if they want a paper invoice, you can print a copy of the transaction. For detailed steps about this, please see this additional QBO support reference .