I keep getting an error message when I try and access a clients self-employed package. HTTP Status 400 – Bad Request

We can follow several troubleshooting procedures to handle the HTTP Status 400 – Bad Request error, David. I'll share them below so you can resolve this matter.
 

The HTTP Status 400 – Bad Request notification occurs when an issue within your browser's system interrupts your server's connection. To fix this problem, ensure that you have a stable internet connection, you're using the latest version of your browser, the URL you're trying to access to open your client's account is accurate. Kindly double-check these factors to narrow down the result.

If you get the same error after double-checking everything, let's follow Chrea's suggestion to open your client's account using a private session. Refer to the keyboard shortcut keys below to proceed:

• Mozilla Firefox: Ctrl + Shift + P
• Microsoft Edge: Ctrl + Shift + N
• Google Chrome: Ctrl + Shift + N
• Safari: Command + Shift + N

Once you can access your client's account seamlessly using incognito mode, revert to your regular browser and clear its cache and cookies. Doing so eliminates outdated browser utilities that can affect the platform's performance. If you get the same result, consider using another supported browser.

I've also attached these resources, which can guide you in administering your client's QuickBooks accounts:

• Open and review clients' QuickBooks Online or Self-Employed accounts
• Manage clients in QuickBooks Online Accountant

Feel free to drop by again in this thread once you have follow-up questions about opening and managing your client's account in the platform. We are always here for you.