Connecting Unity and JS clients to the same room.

I am trying to make a very simple web client which can connect to a room created in PUN to listen for some events display information in the web client.

However I cannot seem to get the web client to see or connect to any of the rooms created by PUN.

I confirmed I am using the same app id, app version, and region.

PUN clients can connect to rooms created by other PUN clients, and likewise JavaScript clients can connect to rooms created by other JavaScript clients.

Am I missing something obvious?

I am happy to post my code if that is helpful.

Thanks in advance for any help