I have a C# program that runs during a transition that uses LoginAuto

In the following manner,

IEdmVault19 EDPMVault = (IEdmVault19)(new EdmVault5());

string VaultName = EDPMVault.GetVaultNameFromPath(fullName);

EDPMVault.LoginAuto(VaultName, 0)

The problem is that it prompts SOME users for the user for their id and password and then states that

they lack the authority to login. Any idea on what the issue is and how to fix it?