QB errors are often common as most of the users face them and they can be resolved on your own. But QuickBooks Error 15222 is different as this technical error happens while downloading a Payroll or QuickBooks Desktop Update. It is better if you reach out to the QB experts to resolve this issue. While downloading the latest update for QB Desktop or payroll service you are likely to face this issue. If you want to try to fix it on your own, you can try the solutions given below-
Install Digital Signature Certificate
Manual Software Update
Validate IE settings
It is always advised not to go deep into the functionality and call the QB support team to help you in resolving the issue.