I’ve read complaints online that Face ID on iPads is defective. I think what’s happening instead is that the biometric security system in Apple’s tablets has been set to be overly exacting. If it seems like Face ID is not working on your iPad, changing a single security setting can help.
I turned off the Require Attention setting on my iPad Pro and it made Face ID noticeably better. Presto, unlocking anything on my iPad became quick and easy. Previously, it felt like the computer was working to avoid giving me access.
Admittedly, changing this setting made my tablet a little bit less secure. But that’s a very small risk for a significant gain in usability. I recommend it to anyone who uses an iPad and thinks Face ID is not working properly.