2 files changed, 3 insertions, 0 deletions
diff --git a/changelog.d/8504.bugfix b/changelog.d/8504.bugfix
new file mode 100644
index 0000000000..2bd0dbb8b4
--- /dev/null
+++ b/changelog.d/8504.bugfix
@@ -0,0 +1 @@
+Expose the `uk.half-shot.msc2778.login.application_service` to clients from the login API. This feature was added in v1.21.0, but was not exposed as a potential login flow.
diff --git a/synapse/rest/client/v1/login.py b/synapse/rest/client/v1/login.py
index d7deb9300d..b82a4e978a 100644
--- a/synapse/rest/client/v1/login.py
+++ b/synapse/rest/client/v1/login.py
@@ -110,6 +110,8 @@ class LoginRestServlet(RestServlet):
             ({"type": t} for t in self.auth_handler.get_supported_login_types())
         )
 
+        flows.append({"type": LoginRestServlet.APPSERVICE_TYPE})
+
         return 200, {"flows": flows}
 
     def on_OPTIONS(self, request: SynapseRequest):