1 files changed, 4 insertions, 2 deletions
diff --git a/synapse/rest/client/account.py b/synapse/rest/client/account.py
index 19c2da4244..0cc87a4001 100644
--- a/synapse/rest/client/account.py
+++ b/synapse/rest/client/account.py
@@ -704,10 +704,12 @@ class ThreepidBindRestServlet(RestServlet):
     async def on_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
         body = parse_json_object_from_request(request)
 
-        assert_params_in_dict(body, ["id_server", "sid", "client_secret"])
+        assert_params_in_dict(
+            body, ["id_server", "sid", "id_access_token", "client_secret"]
+        )
         id_server = body["id_server"]
         sid = body["sid"]
-        id_access_token = body.get("id_access_token")  # optional
+        id_access_token = body["id_access_token"]
         client_secret = body["client_secret"]
         assert_valid_client_secret(client_secret)