Let's perform browser troubleshooting steps to bypass this error message so we can import invoices successfully, Maheshan.

An accumulated cache in your browser can sometimes affect the system's importing performance. I suggest deleting the cache history so the system can start fresh and pinpoint any possible issues with the webpage.

After that, we can return to the import process. Make sure all column headers in your invoices correspond with the field names in your target system.

Also, we can explore different supported browsers to enhance your experience with QuickBooks Online.

I'm including this article to provide additional information about importing invoices into QuickBooks Online (QBO): Import multiple invoices at once in QuickBooks Online.

I'll provide these resources about personalizing and adding specific information to your sales forms and tracking your invoice payments:

• Record invoice payments in QuickBooks Online
• Customize invoices, estimates, and sales receipts in QuickBooks Online

If you need any additional help while managing your invoices in QBO, please don’t hesitate to reach out. 

Same exact issue. I have even started with a brand new browser install on separate device and separate OS. My credentials are supposed to allow invoices. Now what do I do? Thank you.

Furthermore, It could not possibly be a credentials issue as displaying a 404 error can't find page due to credential access mismatch would never be allowed to persist for years by developers working for a top tier company like QuickBooks. This must be something else.

I appreciate the steps you've taken to fix the error when importing invoices into QuickBooks Online (QBO).

Based on your situation, I recommend reaching out to our live experts for personalized assistance. They can securely access your account and provide a solution tailored to the error you received when importing invoices. Since this is a public forum, contacting live support ensures your account information remains private.

Here’s how to get in touch with our support team:

1. Sign in to your QuickBooks Online (QBO) company.
2. Select (?) Help is in the upper right corner of your screen.
3. Type a question or topic you need help with, then select Contact a human.

You can refer to this page to find out the availability of our live experts at your convenience: Support Hours .

Feel free to Reply to this thread if you need further assistance.