QuickBooks has a limitation of 41 characters for customer name fields. If you exceed the character limit, they will not sync with QuickBooks.
We have started updating the system to display fields that exceed the character limit in red on the Customer List Page. When you see this, it's a sign that you need to edit these text entries to under 41 characters for them to sync.
In the future, we will implement this system-wide to ensure a consistent display of exceeded character limits.
You can read more about QuickBooks Character Limitation on their website.