The Sales by Customer Detail report is only available in the Essentials and Plus versions. I think you have the Simple Start version. You can try finding a third-party app that can create this report. Just click the Apps menu in the left navigation bar, or you can check out the Apps store. You can change the flag icon to AU to see the list of apps for your region.
By the way, I got an article with a list of reports in all QBO versions. Please check this out: Report comparison between QuickBooks Online subscriptions.
If you have more questions on your report, feel free to post back.