One way to resolve the HTTP Status 400 - Bad Request error is to use a different browser and ensure your main tool is updated to the latest version, R-warrenfilms.
Outdated browsers can lead to errors and limit access to your QuickBooks Self-Employed (QBSE) account. This issue is naturally resolved by clearing your browsing data.
On top of that, keeping your browser up to date and clearing out old data can help prevent login issues down the line. To update it, simply go to the browser's Settings and select About.
You can also utilise another supported browser as an alternative.
Please reply to this thread if you have any questions or need more help.
