C# Outlook 2016 - COMException (0x80004005) at GetDefaultFolder Method

I created a Windows Form Application that uses the Outlook 2016 COMObject.

But, I am receiving the following error, when trying to get the default folder.

System.Runtime.InteropServices.COMException (0x80004005): The operation failed.
   at Microsoft.Office.Interop.Outlook.NameSpaceClass.GetDefaultFolder(OlDefaultFolders FolderType)

The code breaks in this part.

oApp = new Outlook.Application();
oNS = oApp.GetNamespace("mapi");
oNS.Logon(inbox, password, true, true);
oInbox = oNS.Session.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderSentMail);

Any hint or idea about what is causing this error?

Thanks in advance!

Namespace.Logon takes the name of an existing profile (as shown by Control Panel | Mai l| Show Profiles) or an empty string (to use the default profile). The password parameter is not used.