Hi there, julie131.
The error message you've encountered occurs when the server can't process the request sent by your browser due to an issue, such as invalid data or an incorrect URL. To resolve this, let's perform the troubleshooting steps below.
Firstly, I suggest clearing your browser's cache. This way it removes any stored temporary files or data that is causing the issue. Also, please make sure to use the latest update of your computer and browser for best experience when using with QuickBooks.
On top of that, please double-check the URL or any information you're entering while trying to log in. You can access the QuickBooks Online login page directly, by visiting this website: qbo.intuit.com.
If you have other questions or need further assistance, you're always welcome to comment below.
