diff --git a/keyserver/src/responders/thread-responders.js b/keyserver/src/responders/thread-responders.js
--- a/keyserver/src/responders/thread-responders.js
+++ b/keyserver/src/responders/thread-responders.js
@@ -180,6 +180,8 @@
       threadTypes.LOCAL,
       threadTypes.COMMUNITY_ROOT,
       threadTypes.COMMUNITY_ANNOUNCEMENT_ROOT,
+      threadTypes.COMMUNITY_OPEN_ANNOUNCEMENT_SUBTHREAD,
+      threadTypes.COMMUNITY_SECRET_ANNOUNCEMENT_SUBTHREAD,
     ]),
     ...threadRequestValidationShape,
   }),
diff --git a/web/modals/threads/create/compose-subchannel-modal.react.js b/web/modals/threads/create/compose-subchannel-modal.react.js
--- a/web/modals/threads/create/compose-subchannel-modal.react.js
+++ b/web/modals/threads/create/compose-subchannel-modal.react.js
@@ -99,12 +99,7 @@
 
       return result;
     } catch (e) {
-      await setErrorMessage(
-        e.message === 'invalid_parameters' && announcement
-          ? 'announcement channels currently not available'
-          : 'unknown error',
-      );
-
+      await setErrorMessage('unknown error');
       return null;
     }
   }, [