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Good day, robin39.
QuickBooks Online and Intuit Online Payroll are different platforms. Therefore, adding the existing payroll account to your accounting program is unavailable.
What you can do is export your payroll data to QuickBooks Online. You will need to set up the export preferences to do this.
I've got an article for more details on the steps above: Setup export of IOP data to QuickBooks Online (QBO).
You can always get back to me if you need anything else. Thank you.