Welcome to the Community. Thank you for reaching out and explaining your situation in detail, Sara. We truly appreciate the time and effort you've taken to resolve this issue on your own.
I understand how disruptive this can be to your workflow, especially when you're working on or adjusting your Chart of Accounts.
Given all the troubleshooting steps you’ve already taken, including reaching out to customer service before, but the error persists, we recommend contacting our QuickBooks Live Support team again to report the ongoing issue.
With their specialized tools and access, they can identify the cause of the issue and resolve it efficiently.
Let us know if you need anything else. We’re here to help.