You are following the document for resetting a password on an NSX appliance. The appliance goes through the motions, but after setting the password, you still are not able to login.
VMware NSX
VMware NSX-T Datacenter.
Due to issues in using the console, sometimes when attempting to change the password of an appliance, the session may not send the same keystrokes that you are typing, or the password you are using does not meet the minimum requirements.
Note: While it will allow you to try 3x, the 3rd time appears to be false, and never moves to the confirm password prompt. If you never receive the second password prompt when updating the password, it failed.
See "Resetting the Passwords of An Appliance" in our tech docs.