diff --git a/applications/main/nfc/helpers/protocol_support/mf_ultralight/mf_ultralight.c b/applications/main/nfc/helpers/protocol_support/mf_ultralight/mf_ultralight.c
index daf9bedea..3c041c077 100644
--- a/applications/main/nfc/helpers/protocol_support/mf_ultralight/mf_ultralight.c
+++ b/applications/main/nfc/helpers/protocol_support/mf_ultralight/mf_ultralight.c
@@ -151,8 +151,15 @@ static NfcCommand
         }
         if(!mf_ultralight_event->data->auth_context.skip_auth) {
             mf_ultralight_event->data->auth_context.password = instance->mf_ul_auth->password;
-            mf_ultralight_event->data->key_request_data.key = instance->mf_ul_auth->tdes_key;
-            // TODO: Key provided attribute is not set
+            
+            // Only set tdes_key for Manual/Reader auth types, not for dictionary attacks
+            if(instance->mf_ul_auth->type == MfUltralightAuthTypeManual || 
+               instance->mf_ul_auth->type == MfUltralightAuthTypeReader) {
+                mf_ultralight_event->data->key_request_data.key = instance->mf_ul_auth->tdes_key;
+                mf_ultralight_event->data->key_request_data.key_provided = true;
+            } else {
+                mf_ultralight_event->data->key_request_data.key_provided = false;
+            }
         }
     } else if(mf_ultralight_event->type == MfUltralightPollerEventTypeAuthSuccess) {
         instance->mf_ul_auth->pack = mf_ultralight_event->data->auth_context.pack;
diff --git a/lib/nfc/protocols/mf_ultralight/mf_ultralight_poller.c b/lib/nfc/protocols/mf_ultralight/mf_ultralight_poller.c
index c697544c7..0c24dadd6 100644
--- a/lib/nfc/protocols/mf_ultralight/mf_ultralight_poller.c
+++ b/lib/nfc/protocols/mf_ultralight/mf_ultralight_poller.c
@@ -452,7 +452,26 @@ static NfcCommand mf_ultralight_poller_handler_auth_ultralight_c(MfUltralightPol
         command = instance->callback(instance->general_event, instance->context);
         if(!instance->mfu_event.data->auth_context.skip_auth) {
             FURI_LOG_D(TAG, "Trying to authenticate with 3des key");
-            instance->auth_context.tdes_key = instance->mfu_event.data->key_request_data.key;
+            // Only use the key if it was actually provided
+            if(instance->mfu_event.data->key_request_data.key_provided) {
+                instance->auth_context.tdes_key = instance->mfu_event.data->key_request_data.key;
+            } else if(instance->mode == MfUltralightPollerModeDictAttack) {
+                // TODO: Can logic be rearranged to request this key before reaching mf_ultralight_poller_handler_auth_ultralight_c in poller?
+                FURI_LOG_D(TAG, "No initial key provided, requesting key from dictionary");
+                // Trigger dictionary key request
+                instance->mfu_event.type = MfUltralightPollerEventTypeRequestKey;
+                command = instance->callback(instance->general_event, instance->context);
+                if(!instance->mfu_event.data->key_request_data.key_provided) {
+                    instance->state = MfUltralightPollerStateReadPages;
+                    return command;
+                } else {
+                    instance->auth_context.tdes_key = instance->mfu_event.data->key_request_data.key;
+                }
+            } else {
+                FURI_LOG_D(TAG, "No key provided, skipping auth");
+                instance->state = MfUltralightPollerStateReadPages;
+                return command;
+            }
             instance->auth_context.auth_success = false;
             // For debugging
             FURI_LOG_D(