diff --git a/drivers/nble/gap.c b/drivers/nble/gap.c
index 471451412cf..fe89cee2fe9 100644
--- a/drivers/nble/gap.c
+++ b/drivers/nble/gap.c
@@ -56,14 +56,17 @@ int bt_auth_cb_register(const struct bt_auth_cb *cb)
 	return -ENOSYS;
 }
 
-void bt_auth_passkey_entry(struct bt_conn *conn, unsigned int passkey)
+int bt_auth_passkey_entry(struct bt_conn *conn, unsigned int passkey)
 {
+	return -ENOSYS;
 }
 
-void bt_auth_cancel(struct bt_conn *conn)
+int bt_auth_cancel(struct bt_conn *conn)
 {
+	return -ENOSYS;
 }
 
-void bt_auth_passkey_confirm(struct bt_conn *conn, bool match)
+int bt_auth_passkey_confirm(struct bt_conn *conn, bool match)
 {
+	return -ENOSYS;
 }
diff --git a/include/bluetooth/bluetooth.h b/include/bluetooth/bluetooth.h
index 457657d1739..00054842ca0 100644
--- a/include/bluetooth/bluetooth.h
+++ b/include/bluetooth/bluetooth.h
@@ -272,16 +272,20 @@ int bt_auth_cb_register(const struct bt_auth_cb *cb);
  *
  *  @param conn Connection object.
  *  @param passkey Entered passkey.
+ *
+ *  @return Zero on success or negative error code otherwise
  */
-void bt_auth_passkey_entry(struct bt_conn *conn, unsigned int passkey);
+int bt_auth_passkey_entry(struct bt_conn *conn, unsigned int passkey);
 
 /** @brief Cancel ongoing authenticated pairing.
  *
  *  This function allows to cancel ongoing authenticated pairing.
  *
  *  @param conn Connection object.
+ *
+ *  @return Zero on success or negative error code otherwise
  */
-void bt_auth_cancel(struct bt_conn *conn);
+int bt_auth_cancel(struct bt_conn *conn);
 
 /** @brief Reply if passkey was confirmed by user.
  *
@@ -291,8 +295,10 @@ void bt_auth_cancel(struct bt_conn *conn);
  *
  *  @param conn Connection object.
  *  @param match True if passkey was confirmed to match, false otherwise.
+ *
+ *  @return Zero on success or negative error code otherwise
  */
-void bt_auth_passkey_confirm(struct bt_conn *conn, bool match);
+int bt_auth_passkey_confirm(struct bt_conn *conn, bool match);
 
 #if defined(CONFIG_BLUETOOTH_BREDR)
 /** @brief Reply with entered PIN code.
@@ -302,8 +308,10 @@ void bt_auth_passkey_confirm(struct bt_conn *conn, bool match);
  *
  *  @param conn Connection object.
  *  @param pin Entered PIN code.
+ *
+ *  @return Zero on success or negative error code otherwise
  */
-void bt_auth_pincode_entry(struct bt_conn *conn, const char *pin);
+int bt_auth_pincode_entry(struct bt_conn *conn, const char *pin);
 #endif /* CONFIG_BLUETOOTH_BREDR */
 #endif /* CONFIG_BLUETOOTH_SMP || CONFIG_BLUETOOTH_BREDR */
 
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 05ecc2195cb..1babe2026a1 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2670,75 +2670,80 @@ int bt_auth_cb_register(const struct bt_auth_cb *cb)
 	return 0;
 }
 
-void bt_auth_passkey_entry(struct bt_conn *conn, unsigned int passkey)
+int bt_auth_passkey_entry(struct bt_conn *conn, unsigned int passkey)
 {
 	if (!bt_auth) {
-		return;
+		return -EINVAL;
 	}
 #if defined(CONFIG_BLUETOOTH_SMP)
 	if (conn->type == BT_CONN_TYPE_LE) {
 		bt_smp_auth_passkey_entry(conn, passkey);
+		return 0;
 	}
 #endif /* CONFIG_BLUETOOTH_SMP */
+
+	return -EINVAL;
 }
 
-void bt_auth_passkey_confirm(struct bt_conn *conn, bool match)
+int bt_auth_passkey_confirm(struct bt_conn *conn, bool match)
 {
 	if (!bt_auth) {
-		return;
+		return -EINVAL;
 	};
 #if defined(CONFIG_BLUETOOTH_SMP)
 	if (conn->type == BT_CONN_TYPE_LE) {
 		bt_smp_auth_passkey_confirm(conn, match);
 	}
 #endif /* CONFIG_BLUETOOTH_SMP */
+
+	return -EINVAL;
 }
 
-void bt_auth_cancel(struct bt_conn *conn)
+int bt_auth_cancel(struct bt_conn *conn)
 {
 	if (!bt_auth) {
-		return;
+		return -EINVAL;
 	}
 #if defined(CONFIG_BLUETOOTH_SMP)
 	if (conn->type == BT_CONN_TYPE_LE) {
 		bt_smp_auth_cancel(conn);
-		return;
+		return 0;
 	}
 #endif /* CONFIG_BLUETOOTH_SMP */
 #if defined(CONFIG_BLUETOOTH_BREDR)
 	if (conn->type == BT_CONN_TYPE_BR) {
-		pin_code_neg_reply(&conn->br.dst);
+		return pin_code_neg_reply(&conn->br.dst);
 	}
 #endif /* CONFIG_BLUETOOTH_BREDR */
+
+	return -EINVAL;
 }
 
 #if defined(CONFIG_BLUETOOTH_BREDR)
-void bt_auth_pincode_entry(struct bt_conn *conn, const char *pin)
+int bt_auth_pincode_entry(struct bt_conn *conn, const char *pin)
 {
 	size_t len;
 
 	if (!bt_auth) {
-		return;
+		return -EINVAL;
 	}
 
 	if (conn->type != BT_CONN_TYPE_BR) {
-		return;
+		return -EINVAL;
 	}
 
 	len = strlen(pin);
 	if (len > 16) {
-		pin_code_neg_reply(&conn->br.dst);
-		return;
+		return -EINVAL;
 	}
 
 	if (conn->required_sec_level == BT_SECURITY_HIGH && len < 16) {
 		BT_WARN("PIN code for %s is not 16 bytes wide",
 			bt_addr_str(&conn->br.dst));
-		pin_code_neg_reply(&conn->br.dst);
-		return;
+		return -EPERM;
 	}
 
-	pin_code_reply(conn, pin, len);
+	return pin_code_reply(conn, pin, len);
 }
 #endif
 #endif /* CONFIG_BLUETOOTH_SMP || CONFIG_BLUETOOTH_BREDR */