diff --git a/src/keys/drivers/YubiKeyInterfaceUSB.cpp b/src/keys/drivers/YubiKeyInterfaceUSB.cpp
index fde232d6f..72554a263 100644
--- a/src/keys/drivers/YubiKeyInterfaceUSB.cpp
+++ b/src/keys/drivers/YubiKeyInterfaceUSB.cpp
@@ -151,6 +151,7 @@ YubiKey::KeyMap YubiKeyInterfaceUSB::findValidKeys()
                 auto config = (slot == 1 ? CONFIG1_VALID : CONFIG2_VALID);
                 if (!(ykds_touch_level(st) & config)) {
                     // Slot is not configured
+                    qWarning("YubiKey slot %d is not configured for %s", slot, serial);
                     continue;
                 }
                 // Don't actually challenge a YubiKey Neo or below, they always require button press