React - syncedstore + JsonForms

I'm using json forms to generate forms from a json description. I'm trying to have cooperative filling (multiple users can work on one form at a time, and see changes in real time).

const store = syncedStore({
    formData: {} as object
});

export default function JsonFormComponent() {

    const state = useSyncedStore(store);

    useEffect(() => {
        new WebsocketProvider(
            'ws://localhost:1234',
            'my-room',
            getYjsValue(store)
        );

    }, []);

    <JsonForms
        schema={schema}
        uischema={uiSchema}
        data={state.formData}
        renderers={materialRenderers}
        i18n={{locale: locale, translate: translation}}
        onChange={({data, errors}) => {
            Object.assign(state.formData, data);
        }}
    />

}

But the data is not shared between users. I have no idea where the problem could be. Other examples (todos, code editor) work for me without any problems. The server is running.

Has anyone here solved a similar problem? I haven't found any ready-made or similar solutions on the internet.

thank you for your reply