共享点数据源使用“用作Windows凭据”SQL Server不起作用

I have some reports and a data source on a share point. Everything is working correctly, but I need to change the account used on the data source. I gave permissions to this new account to login in SQL server. When I set the credentials of the new account, on the share point data source, it fails with this error "Log on failed. Ensure the user name and password are correct.", but if I log in using the new account directly in SQL Server it works correctly. I think the problem is only when I try to log in using the share point data source. I have some reports and a data source on a shar