I managed to get my 2018 and 2019 13" MacBook Pro into a state that even xartutil -erase-all will not allow me to add more fingerprints.
Since imaging is no viable deployment method anymore I started experimenting with the -eraseinstall option to do an in-place wipe and reinstall of macOS 10.14. My DEP prestage profile includes registering a fingerprint to make certain the Touch ID is working and we also turn FileVault on via profile to escrow the key into JSS.
This worked great for 15 times and when I tried the 16th time I did no longer get the Touch ID prompt during Apple Assistant Setup. Trying to add a fingerprint via System Preferences shows the well known message that no more fingerprints can be added.
I thought "not a big deal, just run xartutil -erase-all and it will start working again". True for my 2016 and 2017 MacBook Pro (it's actually part of my imaging script) but not for the 2018 and 2019 with T2 chip. It is well known by now that -erase-all will also erase the encryption key and renders the SSD unusable (password is no longer being accepted) even if FileVault is turned off. But I could not find any hints about erase-all not fixing the Touch ID issue anymore.
I will let the Apple Geniuses deal with those two MacBook Pro but I was wondering if any of you is using the -eraseinstall on 2018/2019 MacBook Pro with FV enabled and fingerprints registered and experienced any issues after more that 15 reinstalls.