Some chart of accounts of type Equity may not sync. Please create this chart of account in QBO manually and sync again.
This error can occur if an account created in Bill.com is type 'Equity' and cannot sync to QuickBooks Online (QBO).
Create this account manually in QBO and sync again.
Please note: Be sure to use the exact name and spelling that is in Bill.com when creating the account in QBO to ensure that the accounts link once the sync is performed.