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-rw-r--r--changelog.d/13606.misc1
-rw-r--r--synapse/handlers/event_auth.py9
2 files changed, 4 insertions, 6 deletions
diff --git a/changelog.d/13606.misc b/changelog.d/13606.misc
new file mode 100644
index 0000000000..58a4467798
--- /dev/null
+++ b/changelog.d/13606.misc
@@ -0,0 +1 @@
+Use dedicated `get_local_users_in_room(room_id)` function to find local users when calculating `join_authorised_via_users_server` of a `/make_join` request.
diff --git a/synapse/handlers/event_auth.py b/synapse/handlers/event_auth.py
index a2dd9c7efa..c3ddc5d182 100644
--- a/synapse/handlers/event_auth.py
+++ b/synapse/handlers/event_auth.py
@@ -129,12 +129,9 @@ class EventAuthHandler:
         else:
             users = {}
 
-        # Find the user with the highest power level.
-        users_in_room = await self._store.get_users_in_room(room_id)
-        # Only interested in local users.
-        local_users_in_room = [
-            u for u in users_in_room if get_domain_from_id(u) == self._server_name
-        ]
+        # Find the user with the highest power level (only interested in local
+        # users).
+        local_users_in_room = await self._store.get_local_users_in_room(room_id)
         chosen_user = max(
             local_users_in_room,
             key=lambda user: users.get(user, users_default_level),