How to fix orphaned database login
USE [ReportServer];
GO
EXEC dbo.sp_change_users_login 'Update_One', 'YourDatabaseUser', 'YourDatabaseUser';
{{ message }}
USE [ReportServer];
GO
EXEC dbo.sp_change_users_login 'Update_One', 'YourDatabaseUser', 'YourDatabaseUser';