Error Changing Password via API on x64

[wal18b2s]

Hello,
I'm writing an application for our admin guys but I am stmbling on one hurdle.

On 32/64 OS everything works such as enable/disable user, updating records and such

However on 64OS changing password fails

I have attempted 2 seperate ways one
ent = NWDIR1.FindEntry("NDS:\\BCR\BCR\" & txtOU.Text & "\" & txtUsername.Text)
ent.SetPassword(txtPassword.Text)
ent.Update()

This results in error 0x333 819 Invalid network connection

And also
NWDIRAuth1.FullName = "NDS:\\BCR\BCR\" & txtOU.Text & "\" & txtUsername.Text
NWDIRAuth1.ChangePassword(txtPassword.Text)

This results in API error 0x80048801

Both 64 bit systems are logged in as admin

Any ideas?

Robbie