Let me help you get past the error you're encountering so you can run payroll for your employee successfully.
We haven't received any similar reports about the error you're getting when processing payroll in QuickBooks Online (QBO). To check if it caused by the browser, let's perform some basic troubleshooting steps by logging in to QBO using a private browser or incognito window. This mode allows you to do a clean search, free from the influence of previous browsing history and network.
Here are the keyboard shortcuts to open private browser:
Google Chrome: press Ctrl+Shift+N
Mozilla Firefox: press Ctrl+Shift+P
Internet Explorer: press Ctrl+Shift+P
Safari: press Command+Shift+N
If it work fine with private browser, I suggest clearing your browser's cache to start fresh. The next time you log in to QBO, your browser will download fresh copies of everything you see on each page. Any cache-related issues should be cleared up.
For additional reference, you can check these articles below: