From @neilk "I worked with Nokia support earlier today and after the suggestion to boot into safe mode I encountered no more fingerprint read failures. I then started removing apps that had gotten installed as part of the restore process from my previous phone (Nexus 6p). I eliminated apps I no longer required and I still am having a 100% success rate on fingerprint reads. It unlocks on the first time for the past 8 hours. Hopefully, this continue in the future." This is terrific news!