Assuming the administration tools installed over Altus Workstation (with the Microsoft admin tools suite installed) or Altus Server (on a DC):
Simply right-click the targeted User in AD Users and Computers and choose "Delete credentials..." and follow the wizard.
The delete credentials option is only available against Users taking a license. To avoid this situation clear credentials before removing the license. (How to rectify the situation where users have registered fingerprints but are not using a license? Try to enroll a PIN so as to get a license so as to un-grey the delete creds in ADUC.)