The program keeps telling me his social securing number is a duplicate and belongs to another employee , so what do I do?

Hello there, @jvw1.

Let me help you fix your employee's SSN in QuickBooks Online.

There's an inactive employee on your employees' list in this scenario. What we need to do is to activate them to resolve this problem.

here's how:

1. Click Payroll in the left panel and choose Employees.
2. From the Active Employees drop-down, filter All Employees.
3. Double-click the employee's name that duplicates.
4. Besides the Employment, click the pencil icon to edit.
5. Change the to Active.

You can also verify if there are multiple SSNs for the employee setup by going to the Reports page.

Here's how:

1. On the left pane, click the Reports tab.
2. Search for Employee Contact List on the search tab.
3. Next, to customize the report, select Customize button.
4. Hit the Rows/Columns dropdown, then put a check in the box for SSN and other details you'll want to include in the list.
5. At the bottom, choose Run Report. 

You can also refer to the screenshot below for you guide:

Furthermore, you can get more details about modifying an employee's status in this article: Terminate or change your employee in QuickBooks Online. 

Feel free to visit this link for more details about managing employee information:

• Change an employee's payroll history.
• Change or delete a payroll deduction item in Online Payroll.

Anytime you have questions about employees or anything in QuickBooks, you can post them here. I'd be happy to answer. Have a good one!