Connecting android signalr client to (normal) signalr web api

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C#

SignalR

Xamarin

Hi,

I am trying to connect an android phone via signalr core to a normal (net461) signalr web api. And it always just hangs on the last line as per below.

hubConnection = new HubConnectionBuilder().WithUrl("http://machineNameorIPaddress:85/signalr/myHub").Build();
hubConnection.StartAsync().Wait();

On both phone and desktop:
If I navigate to the url without the signalr path it loads successfully. If I load that full url into the browser (with the full signalr hub path), I get a "Protocol error: Unknown transport." response.

My other project (a desktop app which is not Core signalr but net461) connects and works fine.

What I have tried:

Tried the noted code in
1 - the OnCreate of the xamarin project main activity
2 - a button click of the portable project
3 - a dependancy injected object called from the portable project (on the same above button click event)