Hello, we are currently using SQL Server Reporting Services and we would like to use Report Builder so our customers can create reports themselves. I have created a User on the server. I have added this user to the SQLServerMSSQLUser and SQLServerReportServerUser groups. I have given this User db_datareader access to the required database and to the Reporting Services database. I've also tried giving the User db_owner access to the Reporting Services db's. And on the Report Manager, this User is a System_User, but has all access (every checkbox is checked).

When I connect using Report Builder, I can select the Report Model to create a DataSource, but when I try to create a DataSet, I get the following error: An error occurred while connection to datasource 'DataSource1'. The details are: 'User Not Authorized'.

Does anyone know what server permissions I forgot to set? I'm assuming it's a Windows permissions issue because I do not see any database login errors in the event logs.