If you are a new customer to Klipboard, the best practise is for no Invoices to be created on Klipboard until you have connected your Quickbooks account.

However if you wish to do so please ensure to set the correct Invoice Start number within the Klipboard Settings area so Invoice numbering is aligned with your existing Quickbooks account.

Any Invoices created within Klipboard before you connect with Quickbooks will be synced on the first time connection with Quickbooks