QuickBooks Online Sync Error: a client, account, or invoice connected with this payment is deleted in QBO
Why the Sync Error occurs
This error occurs when a merchant account or customer on an invoice payment or the invoice itself that the payment is wanting to sync to has been deleted in QuickBooks Online (QBO). Without having the account, customer, or invoice, the payment cannot sync.
How to Fix the Sync Error
In QBO, verify that the account or customer noted on the payment has been deleted or see whether the invoice was deleted
After the deleted entity is found, reactivate it
Sync again.
If you are facing QuickBooks Online Sync Error, contact QuickBooks.