diff --git a/mautrix_appservice/intent_api.py b/mautrix_appservice/intent_api.py
index a0b18056..6b411cec 100644
--- a/mautrix_appservice/intent_api.py
+++ b/mautrix_appservice/intent_api.py
@@ -198,7 +198,7 @@ class IntentAPI:
         return self.client.create_room(alias, is_public, name, topic, is_direct, invitees,
                                        initial_state or {})
 
-    def invite(self, room_id, user_id, check_cache):
+    def invite(self, room_id, user_id, check_cache=False):
         self.ensure_joined(room_id)
         try:
             ok_states = {"invite", "join"}
diff --git a/mautrix_telegram/commands.py b/mautrix_telegram/commands.py
index ea3d3340..5375b443 100644
--- a/mautrix_telegram/commands.py
+++ b/mautrix_telegram/commands.py
@@ -334,8 +334,12 @@ class CommandHandler:
             updates = sender.client(JoinChannelRequest(channel))
         for chat in updates.chats:
             portal = po.Portal.get_by_entity(chat)
-            portal.create_matrix_room(sender, chat, [sender.mxid])
-            self.reply(f"Created room for {portal.title}")
+            if portal.mxid:
+                portal.create_matrix_room(sender, chat, [sender.mxid])
+                self.reply(f"Created room for {portal.title}")
+            else:
+                portal.invite_matrix([sender.mxid])
+                self.reply(f"Invited you to portal of {portal.title}")
 
     @command_handler
     def create(self, sender, args):