Found Face ID not working on my iPad Pro since update to 16.4.1. Didn't worry about it for a while because I was using it in circumstances where I know that Face ID is not always reliable.
However, today I had some time to sort it out, there is clearly a mess. First, it acted as if Face ID didn't exist - went straight to passcode.
Then I tried changing settings - removed the need for attention. No change. Tried to reset Face ID. Said I had to do that in portrait - then seemed to act as if Face ID was unusable/unavailable. Restart. Re-established Face ID. Seems to be working.
First time I have had issues with Face ID on iPhone or iPad since my first use of it. But very glad it went wrong on my iPad rather than my iPhone.
However, today I had some time to sort it out, there is clearly a mess. First, it acted as if Face ID didn't exist - went straight to passcode.
Then I tried changing settings - removed the need for attention. No change. Tried to reset Face ID. Said I had to do that in portrait - then seemed to act as if Face ID was unusable/unavailable. Restart. Re-established Face ID. Seems to be working.
First time I have had issues with Face ID on iPhone or iPad since my first use of it. But very glad it went wrong on my iPad rather than my iPhone.