Issue : Unable to integrate customer into QuickBooks Online from Salesforce even though the     Salesforce Account does not exists in QuickBooks as a Customer. 

Reason : Either a Vendor or Contractor or an Employee exists in QuickBooks with the same name as Salesforce Account, hence customer will not be created. 

• Error in DBSync Logs:

<Error code="6240" element="">

<Message>Duplicate Name Exists Error</Message>

<Detail>The name supplied already exists. : Another customer, vendor or employee is  

already using this name. Please use a different name.</Detail>

</Error>

• Error in the Browser:

• Account in Salesforce (Customer/Vendor Test):

• Vendor/Contractor already exists in QuickBooks with the same name:

Solution:

1. Rename the Vendor/Employee name in QuickBooks other than Salesforce Account name.

2. Rename the Account name in Salesforce other than QuickBooks Vendor/Contractor/Employee name.

3. Delete the Vendor in QuickBooks if it is not required.

• Renaming the Account name in Salesforce as Customer/Account Testing:

• Customer has been created in Quickbooks: