The steps to upgrade your payroll in QuickBooks Online (QBO) may differ depending on your current subscription. If you're using PaySuite, you'll need to manually move your data to QuickBooks Standard or Advanced Payroll. For more information about the process, please refer to this article: Upgrading from PaySuite - FAQ.
On the other hand, if you're trying to upgrade from QuickBooks Standard to Advanced Payroll, I highly suggest contacting our Support team. They have the tools that can help you with the process.
Here's how to reach them:
In QBO, click the Help (question mark) icon at the top right.
Select Contact Us at the bottom to connect with our live support.