diff --git a/sat/plugins/plugin_xep_0277.py b/sat/plugins/plugin_xep_0277.py
index 1e40898a..2f3d5fdf 100644
--- a/sat/plugins/plugin_xep_0277.py
+++ b/sat/plugins/plugin_xep_0277.py
@@ -109,7 +109,7 @@ class XEP_0277(object):
             "mbSend",
             ".plugin",
             in_sign="ssss",
-            out_sign="",
+            out_sign="s",
             method=self._mbSend,
             async_=True,
         )
@@ -948,7 +948,7 @@ class XEP_0277(object):
         data: dict,
         service: Optional[jid.JID] = None,
         node: Optional[str] = NS_MICROBLOG
-    ) -> None:
+    ) -> Optional[str]:
         """Send XEP-0277's microblog data
 
         @param data: microblog data (must include at least a "content" or a "title" key).
@@ -957,6 +957,7 @@ class XEP_0277(object):
             None to publish on profile's PEP
         @param node: PubSub node to use (defaut to microblog NS)
             None is equivalend as using default value
+        @return: ID of the published item
         """
         # TODO: check that all data keys are used, this would avoid sending publicly a private message
         #       by accident (e.g. if group plugin is not loaded, and "group*" key are not used)
@@ -975,7 +976,8 @@ class XEP_0277(object):
         except error.StanzaError:
             log.warning("Can't create comments node for item {}".format(item_id))
         item = await self.data2entry(client, data, item_id, service, node)
-        return await self._p.publish(client, service, node, [item])
+        await self._p.publish(client, service, node, [item])
+        return item_id
 
     def _mbRepeat(
             self,