diff --git a/fhem/FHEM/96_allowed.pm b/fhem/FHEM/96_allowed.pm
index 9512279be..1fdd4b8d9 100644
--- a/fhem/FHEM/96_allowed.pm
+++ b/fhem/FHEM/96_allowed.pm
@@ -80,6 +80,7 @@ allowed_Authorize($$$$)
     # Return 0: allow stacking with other instances, see Forum#46380
     return 0 if($me->{allowedCommands} =~ m/\b\Q$arg\E\b/);
     Log3 $me, 3, "Forbidden command $arg for $cl->{NAME}";
+    stacktrace() if(AttrVal($me, "verbose", 5));
     return 2;
   }
 
@@ -87,6 +88,7 @@ allowed_Authorize($$$$)
     return 0 if(!$me->{allowedDevices});
     return 1 if($me->{allowedDevices} =~ m/\b\Q$arg\E\b/);
     Log3 $me, 3, "Forbidden device $arg for $cl->{NAME}";
+    stacktrace() if(AttrVal($me, "verbose", 5));
     return 2;
   }