As far as I know, there is currently no script command to independently disable face lock.
For Samsung devices using Android-Enterprise device agent, the Knox Service Plug-in (KSP) deployed from Managed Google Play Store provides advanced option to disable/enable face authetication without needing any paid KNOX premium license. However, it is advisable to try out KSP first with a test device that can be factory reset without data loss, as using KSP imptoperly may lock advice out of control from both the device-user or MDM/EMM totally.
Thank you for your post, please provide OS version of the devices and MobiControl Agent version
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