diff --git a/targets/stm32l432/src/app.h b/targets/stm32l432/src/app.h
index dadafc1..6afe0bb 100644
--- a/targets/stm32l432/src/app.h
+++ b/targets/stm32l432/src/app.h
@@ -38,7 +38,7 @@
 
 //#define ENABLE_U2F_EXTENSIONS
 
-// #define ENABLE_U2F
+#define ENABLE_U2F
 
 #define DISABLE_CTAPHID_PING
 #define DISABLE_CTAPHID_WINK
diff --git a/targets/stm32l432/src/nfc.c b/targets/stm32l432/src/nfc.c
index df0f9f3..4551c28 100644
--- a/targets/stm32l432/src/nfc.c
+++ b/targets/stm32l432/src/nfc.c
@@ -326,8 +326,13 @@ void nfc_process_iblock(uint8_t * buf, int len)
 
         case APDU_FIDO_U2F_REGISTER:
 			printf1(TAG_NFC, "U2F Register command.\r\n");
+            ctap_response_init(&ctap_resp);
+			u2f_request(apdu, &ctap_resp);
+			status = ctap_resp.data[0];
+			printf1(TAG_NFC, "U2F resp: %d  len: %d\r\n", status, ctap_resp.length);
 
-			nfc_write_response(buf[0], SW_COND_USE_NOT_SATISFIED);
+//			nfc_write_response(buf[0], SW_COND_USE_NOT_SATISFIED);
+			nfc_write_response_chaining(buf[0], ctap_resp.data, ctap_resp.length);
         break;
 
         case APDU_FIDO_U2F_AUTHENTICATE: