Hi seth-yychannel-c,
Thanks for reaching out to us here. The error you are receiving when trying to log into QuickBooks Self Employed, is definitely of some concern. I'm happy to assist.
Error 400, indicates the server won't process the request for security reasons. I'd like to start off by troubleshooting this error to determine if it's a browser-related issue. Clearing cache and cookies is a great way to clean your browser, allowing it to work more efficiently. Here's an article that shows you how to do that: Clear cache and cookies.
In case this error persists, I encourage you to contact our support team so they can assist you further. Here are our contact details:
- Schedule a Callback or start a Chat: click (?) in the upper right in QuickBooks Online > enter "Contact support" > choose Contact Us > provide a brief summary > select Let's Talk > choose Get a callback or Start a Chat.
- Social Media: Facebook, Twitter, and Instagram.
- Support hours are from Monday to Friday between 9 a.m. and 8 p.m. ET.
I'll be one message away in case you need further assistance. Take care!
