When you restart Coop, do you still see empty messages, or does it load now? If not, there is a bug somewhere, and I need to check it.

@reya this is strange. I am unsure how the relay would say OK without an event ID this should never happen. It could be a bug with multi-auth or something but I would need to see a dump of the websocket to debug. Typically I use wireshark for this.