Thanks for taking the time to contact us, BBPJessica. I understand that it can be a hassle when error messages show up when logging in. 

Accumulated data or other browser-related issues can cause this type of error when logging in to QuickBooks Online. I'm here to share the steps that can remove the error so the user can log in without getting it again.

First, let the user use a supported, up-to-date browser.

Second, ask the user to do the following steps:  

1. Try using a private or incognito browser.
2. Restart your browser.
3. Clear your browser's cache.
4. Add Intuit as a trusted site.

After that, let them log back in and check if you can save the financial year information successfully.

If you can do this without any issues, return to regular browsing and follow the instructions in this article on how to clear some saved data: Clear Cache And Cookies To Fix Issues When Using QuickBooks Online.

Lastly, allow me to share these resources in case you need more guidance when logging in to QBO:

• Update Or Change Your Intuit Account Sign-in Information
• Recover Your Intuit Account If You Can’t Sign In

Please remember that you can always tap on us and post questions in the forum if you need more help when managing users and other bookkeeping tasks in QuickBooks. We're open all the time to make sure everything in your account is working properly.