QuickBooks Online sync error: Invalid entity data. phone: Maximum length cannot be greater than 21 characters
Why the sync error occurs
This error occurs when a vendor with an entry in the phone number field is attempting to sync from QuickBooks online to Key CashFlow, but the phone number is longer than 21 characters in QuickBooks Online.
How to fix the sync error
Edit the vendor's phone number in QuickBooks Online so it's 21 characters or less, and sync again.