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Thanks for reaching out to us regarding the error 400 when logging in to QuickBooks Online (QBO), @dacapo.
I've checked and found no investigation related to the Bad request error at the moment. I know having this problem can be time consuming, especially when you already tried all possible troubleshooting. With that, I wanted to ensure you're connected to the right support to help you with this issue.
Here's how you can contact our Customer Service:
- Go to the Help menu then choose the Search tab.
- At the bottom click on Contact us.
- Enter the keyword Account Management and Billing in the What can we help you with? box.
- On the next screen, scroll down to How would you like to connect with us section.
- Choose your contact option to initiate a discussion with a live agent.
In the meantime, if you have other devices, try and see if you can access your account.
Post here again for the result. I want to know if the troubleshooting worked for you or if you have other concerns with the other features in QuickBooks. I'll be right here anytime to assist you. Have a nice day!