I'll ensure you can log in to your QuickBooks Online account, Dawn. Let me share some troubleshooting steps to overcome the error you received when accessing your company file.

The cause of error 429 can be the accumulated data that gets outdated over time. These corrupted cache files can interrupt our experience accessing websites, including QuickBooks Online.

To get this resolved, please utilize a private window when signing in to your account to avoid any browser-related issues. Once logged in, clear the cache from your regular browser to refresh the website preferences. For the detailed process, refer to the information provided by my colleague above.

If the issue persists, I recommend contacting our customer support team during their support hours. They can identify the root cause of this issue and provide the most appropriate resolution with their tools and expertise. To connect with them, locate their contact details in the lower section of this material: QuickBooks Online Support.

Here's a screenshot for your convenience:

On the other hand, consider scanning these resources for guidance if you happen to forget your sign-in credentials so we can recover your account or if you decided to update related information for security purposes:

• Recover your Intuit Account if you can’t sign in
• Update or change your Intuit Account sign-in information

Please tag me in this thread for any future concerns when logging in to your QuickBooks Online account. I can provide relevant information to help you thoroughly.