Attempting to use SignalR Service Upstream with Azure Functions locally

Question

Hello,

I am currently trying to stand up the Bidirectional Chat SignalR Example BidirectionChat, but I'm attempting to do it while running my functions locally. I've followed an answer I found in a thread debug-function-using-a-signalrtrigger.html, but I seem to be encountering an error. My negotiate function seems to execute properly, and I see an incoming POST request from what I assume is the SignalR Service with this error 500 An item with the same key has already been added. Key: scope. Can anyone explain to me what this error means or what I can do to resolve this?

Thanks in advance!