Is Face Unlock working ?

We are testing at the moment our integration of the Face ID/Touch ID Android Biometric plugin.
It seems pretty much OK on iOS but on Android, we only manage to use the Fingerprint Unlock, not the Face Unlock.
We tried on several devices : Samsung A50, Samsung S20, Samsung Xcover 7, which are all supposed to be compatible.
Do you have any further clue on how to use Median or fix this ?

Best regards,

Antoine