diff --git a/apps/participation/models.py b/apps/participation/models.py
index 03bbd58..b62b1a9 100644
--- a/apps/participation/models.py
+++ b/apps/participation/models.py
@@ -1,3 +1,4 @@
+import asyncio
 import os
 import re
 
@@ -56,6 +57,7 @@ class Team(models.Model):
             "hotline",  # TODO Use a custom sympa template
             f"Liste de diffusion pour contacter l'équipe {self.name} des Correspondances",
             "education",
+            raise_error=False,
         )
 
     def delete_mailing_list(self):
@@ -68,6 +70,7 @@ class Team(models.Model):
 
             Matrix.create_room(
                 visibility=RoomVisibility.private,
+                name=f"#équipe-{self.trigram.lower()}",
                 alias=f"team-{self.trigram.lower()}",
                 topic=f"Discussion de l'équipe {self.name}",
                 preset=RoomPreset.private_chat,
diff --git a/apps/participation/views.py b/apps/participation/views.py
index fa6d6bf..b9345b9 100644
--- a/apps/participation/views.py
+++ b/apps/participation/views.py
@@ -1,11 +1,12 @@
+import asyncio
 from io import BytesIO
-import os
 from zipfile import ZipFile
 
 from django.shortcuts import redirect
-from django.views.generic.base import View, TemplateView
+from django.views.generic.base import TemplateView
 
 from corres2math.lists import get_sympa_client
+from corres2math.matrix import Matrix
 from corres2math.views import AdminMixin
 from django.contrib.auth.mixins import LoginRequiredMixin
 from django.core.exceptions import PermissionDenied
@@ -51,6 +52,9 @@ class CreateTeamView(LoginRequiredMixin, CreateView):
         registration.save()
         get_sympa_client().subscribe(user.email, f"equipe-{form.instance.trigram.lower()}", False,
                                      f"{user.first_name} {user.last_name}")
+
+        Matrix.invite(f"#team-{form.instance.trigram.lower()}:correspondances-maths.fr",
+                      f"@{user.registration.matrix_username}:correspondances-maths.fr")
         return ret
 
     def get_success_url(self):
@@ -82,6 +86,9 @@ class JoinTeamView(LoginRequiredMixin, FormView):
         registration.save()
         get_sympa_client().subscribe(user.email, f"equipe-{form.instance.trigram.lower()}", False,
                                      f"{user.first_name} {user.last_name}")
+
+        Matrix.invite(f"#team-{form.instance.trigram.lower()}:correspondances-maths.fr",
+                      f"@{user.registration.matrix_username}:correspondances-maths.fr")
         return ret
 
     def get_success_url(self):
diff --git a/apps/registration/auth.py b/apps/registration/auth.py
index dd993e1..d2febf4 100644
--- a/apps/registration/auth.py
+++ b/apps/registration/auth.py
@@ -9,6 +9,6 @@ class CustomAuthUser(DjangoAuthUser):
     def attributs(self):
         d = super().attributs()
         if self.user:
-            d["matrix_username"] = f"corres2math_{self.user.pk}"
+            d["matrix_username"] = self.user.registration.matrix_username
             d["display_name"] = str(self.user.registration)
         return d
diff --git a/apps/registration/models.py b/apps/registration/models.py
index 71c890d..de33c65 100644
--- a/apps/registration/models.py
+++ b/apps/registration/models.py
@@ -64,6 +64,10 @@ class Registration(PolymorphicModel):
     def is_admin(self):
         return isinstance(self, AdminRegistration) or self.user.is_superuser
 
+    @property
+    def matrix_username(self):
+        return f"corres2math_{self.user.pk}"
+
     def get_absolute_url(self):
         return reverse_lazy("registration:user_detail", args=(self.user_id,))
 
diff --git a/corres2math/matrix.py b/corres2math/matrix.py
index 94c7b67..ea6274d 100644
--- a/corres2math/matrix.py
+++ b/corres2math/matrix.py
@@ -1,24 +1,22 @@
 import asyncio
 from typing import Any, Dict, Optional, Union
 
+from asgiref.sync import async_to_sync
 from nio import AsyncClient, RoomCreateError, RoomCreateResponse, RoomInviteError, RoomInviteResponse, RoomPreset, \
-    RoomVisibility
+    RoomVisibility, RoomResolveAliasResponse
 
 
 class Matrix:
     @classmethod
-    def _get_client(cls) -> AsyncClient:
-        if hasattr(cls, "_client"):
-            return cls._client
-
-        async def login():
-            cls._client = AsyncClient("https://correspondances-maths.fr", "@corres2mathbot:correspondances-maths.fr")
-            await cls._client.login("toto1234")
-            return cls._client
-        return asyncio.get_event_loop().run_until_complete(login())
+    async def _get_client(cls) -> AsyncClient:
+        # TODO Store
+        client = AsyncClient("https://correspondances-maths.fr", "@corres2mathbot:correspondances-maths.fr")
+        await client.login("toto1234")
+        return client
 
     @classmethod
-    def create_room(
+    @async_to_sync
+    async def create_room(
             cls,
             visibility: RoomVisibility = RoomVisibility.private,
             alias: Optional[str] = None,
@@ -34,10 +32,21 @@ class Matrix:
     ) -> Union[RoomCreateResponse, RoomCreateError]:
         resp: Union[RoomCreateResponse, RoomCreateError]
 
-        return asyncio.get_event_loop().run_until_complete(cls._get_client().room_create(
+        client = await cls._get_client()
+        return await client.room_create(
             visibility, alias, name, topic, room_version, federate, is_direct, preset, invite, initial_state,
-            power_level_override))
+            power_level_override)
 
     @classmethod
-    def invite(cls, room_id: str, user_id: str) -> Union[RoomInviteResponse, RoomInviteError]:
-        return asyncio.get_event_loop().run_until_complete(cls._get_client().room_invite(room_id, user_id))
+    async def resolve_room_alias(cls, room_alias: str) -> str:
+        client = await cls._get_client()
+        resp: RoomResolveAliasResponse = await client.room_resolve_alias(room_alias)
+        return resp.room_id
+
+    @classmethod
+    @async_to_sync
+    async def invite(cls, room_id: str, user_id: str) -> Union[RoomInviteResponse, RoomInviteError]:
+        client = await cls._get_client()
+        if room_id.startswith("#"):
+            room_id = await cls.resolve_room_alias(room_id)
+        return await client.room_invite(room_id, user_id)