Windows fingerprint only works when you login with your password, go to settings, security and uncheck-check Windows Hello.
Then you close Enpass and start Enpass again and you see the smiley to login with your fingerprint.
But first you have to click on the smiley otherwise it wont work.(its much easyer on Android)
If you shut down your computer and would like to use Enpass again you have todo everything again to get it work.