Xero requires asset accounts to be enabled for payments before they can be used for bill payments. If you try to sync a bill paid with a payment method linked to a non-enabled asset account, the sync will fail.
Follow the steps below to enable an asset account for payments in Xero:
Log into Xero
Open the Accounting menu
Select Chart of accounts
Click the account to open its details
Select "Enable payments to this account"
Click "Save"
Now, you can try to sync the bill again.
Having issues? Refer to this help article from Xero or contact us.