I'm having the same issue. I have Quickbooks Online Payroll and I'm trying to export to our Quickbooks online account (like a previous poster, we used to use Intuit Payroll and when it was discontinued, it was migrated to QB Payroll, but could not merge with our existing QB Online company, which is why we have two) I've spent HOURS on chat sessions about this. I've tried incognito, clearing the cache, trying a new browser, trying a different device. I have tried to disconnect exporting, but was not able to re-connect to the QB online. The login information is correct, it just keeps reloading the sign in page. It's beyond frustrating, I need to export these payroll transactions so I can close out August.