applet_namespace_pattern_invalid· code· HTTP 400· scope endpointA namespaces.actors pattern in the submitted Applet package or derived registration violates the actor namespace pattern shape: it is not a did:webvh pattern, its SCID segment is neither '*' nor a non-empty SCID, it pins the registration's own service SCID in the SCID segment so it can never match a compliant Ghost, its host segment is not a literal equal to the host of the bare did the service_id currently resolves to, or no segment follows that host. Install preview and install commit both fail closed. See zh/extensions/applet-schema.md 2 and zh/extensions/applet-integration.md 4.1.