win_user fails to change password, but password changes!

The whole test playbook is here;

  • hosts: windows
    gather_facts: false
    tasks:
  • name: Change Administrator password
    win_user: name=Administrator password=Quaiqu6I password_never_expires=yes

Running with ansible 2.1.1.0, and Windows 2012 R2 as client.
http://pastebin.com/2Wg9qYMt

but, if I change the access password - the playbook works well,
so, the password was changed.

Why it throws an error here?