I remember this application. That was a while ago.
Ricoh may have changed the cloud api.
Have you looked at this:
ricoh-cloud-sdk-js/samples/sfu-server at master · ricohapi/ricoh-cloud-sdk-js · GitHub
You may be able to get WebRTC going with other solutions as well.
In particular, this one may work:
This one covers THETA V and Skyway. It might also be useful. It’s a similar technique.