QuickBooks Online Sync Error: String length specified does not match the supported length. Min:0 Max:21 supported. Supplied length:XX

Why the Sync Error occurs

This error occurs when a vendor credit in Bill.com is attempting to sync to QuickBooks Online (QBO), but the reference number is greater than 21 characters.

How to Fix the Sync Error

  1. In Bill.com, edit the vendor credit reference number to be fewer than 21 characters
  2. Sync again