I want to make sure you're able to run your payroll on time. Before anything else, I want to know what problem are you getting when you log in to your QBO account. Did you get any error messages or alerts? It would be helpful if you can share it here so I can provide the most accurate resolution to your concern.
In the meantime, try using a private window and see if you can get in and do payroll. Sometimes, browser issues can affect the performance of QuickBooks as the data in the cache stacks up. This is because it will constantly overwrite itself without deleting the old stuff. The private window will not save any history making it a good place to identify browser problems.
To open a private browser, use these keyboard shortcuts to launch private browsing:
Google Chrome: press Ctrl + Shift + N
Mozilla Firefox: press Ctrl + Shift + P
Safari: press Command + Shift + N
If you no longer see this alert in private browsing, clear the browser's cache. This will help delete the history of the browser, so you can start in a clean slate.
I'll wait for your response here, as I want to make sure this is fixed. I'll be right here if you need further help. Enjoy the rest of the day!