Hi
Below is my code. What is the version of your Power BI Desktop?
let Source = Sql.Database("powebiazure.database.windows.net", "powerbisqlazure"), SalesLT_Address = Source{[Schema="SalesLT",Item="Address"]}[Data]in SalesLT_Address
Besides, do you use the following entry to connect to Azure SQL? And does your PBIX file contain only Azure SQL data source as shown in the second screenshot?
Thanks,
Lydia Zhang