Solution for: OLE DB or ODBC error:Login failed for user NT Service\MSSQLServerOLAPService error - create new login in the SQL Server database engine so analysis services can read the data in the database being analyzed.Create login and grant access:Open up SQL Server Management Studio [login to the database engine]> Security > Login (Right click) > New Login >add user: "NT Service\MSSQLServerOLAPService">select the database being analyzed in the drop-down list at the bottom >
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