It means that you have an Employee or a Customer record in QuickBooks Online with the same name as the Submitter on your expense report.

We cannot create a Vendor Record with the same name if it already exists in QuickBooks Online as an Employee or a Customer.

QuickBooks Online won't allow you to have an Employee, Customer and Vendor with the same name.

You can access the Employee or Customer record for your Submitter in QuickBooks Online and edit their name.

The name has to be differentiated from the name they have on their Travelstop account.

Once done, you can reaccess the expense report on Travelstop and click Export > Sync with QuickBooks Online to trigger manual sync.