--- fprintd-v1.90.5/data/net.reactivated.Fprint.conf.orig	2020-12-06 10:52:03.685456024 +0100
+++ fprintd-v1.90.5/data/net.reactivated.Fprint.conf	2020-12-06 10:52:07.174451479 +0100
@@ -13,7 +13,9 @@
   <!-- Anyone can talk to the service -->
   <policy context="default">
     <allow send_destination="net.reactivated.Fprint"
-           send_interface="net.reactivated.Fprint"/>
+           send_interface="net.reactivated.Fprint.Manager"/>
+    <allow send_destination="net.reactivated.Fprint"
+           send_interface="net.reactivated.Fprint.Device"/>
 
     <!-- Basic D-Bus API stuff -->
     <allow send_destination="net.reactivated.Fprint"