I've read through this conversation and found out that you're using Full Service payroll, tah-difinitigrou.
Based on your reply on Angelyn_T post, the option to delete a payroll deduction item isn't available since you're using Full-Service Payroll.
That being said, you'll have to reach out to our Payroll Support team. We have designated agents that can delete the payroll item for you any time and any day.
Here's how you can contact us:
I also have here a reference on what you can do with QuickBooks Online Payroll Full Service: QuickBooks Online Payroll Full Service Hub.
Feel free to mention my name in your Reply. I'm always around if you need help. Stay safe!