Thank you for reaching out to the QuickBooks Online community, Brinksman.

Your question is important to us, and I want to ensure I fully understand it so that I can provide the best support possible. When you click on the Social Security Number field, what happens exactly? For example, is the field grayed out, does it not let you type anything, or does it show an error message when you try to save?

Does the employee enter their SSN via the Workforce self-service portal, or are you trying to enter it in QuickBooks Online Payroll? Is this the first time you are trying to enter your Social Security Number for the employee, or are they a rehired employee?

Looking forward to your reply so we can get this resolved for you.