To export a list of your clients/customers from QuickBooks online to an Excel spreadsheet please follow the steps below.
First log in to your QuickBooks Online account. Then hover over Sales on the left and click on Customers on the popup.
Once on the Customers page find and click on the Export to Excel option.
The customer list will download to your computer. It may be helpful to show it in the folder to see where it downloaded by clicking on the arrow and selecting Show in Folder.
Once the file has downloaded you can attach it to an email and send it to AMT.