This post will describe how to enable it, I would prefer if VMware can make this functionality available using View admin portal.
Please see here, for the current VMware document.
 To enable this first log in to View Connection Server and open ADSI Edit.
 In the connection settings window select “select or type a Distinguished Name or Naming Context:” and type ” DC=vdi,DC=vmware,DC=int “
Select “Select or type a domain Server” and type ” localhost:389 ” as per below screenshot
Click apply and Ok and exit the EDSI, the new setting will take effect immediately.
Now time to check with iOS device.
 Before you start testing make sure the following
[a] Your iOS device has touchID functionality
[b] You have to download HorizonView client version 3.5.1 and above for iOS device
[c] You must have 3rd party valid trusted signed certificate to work and also make sure on your iOS device only below two options are valid. (To change this setting go to Settings on your iOS device > scroll down where you can see Horizon and select one of the two options highlighted below)
Open Horizon View Client and log on, you will see a new login screen as below and a toggle button to Enable Touch ID.