How to increase SignalR Timeout

I'm running a WebAPI project using Visual Studio 2022 and .net9. I also have a Blazor Web App which uses the API. There is a SignalR connection between the two. I keep getting timed out while stepping through code in 15 seconds. I've tried a few things I got from here, but no luck.

I have this in the API

builder.Services.AddSignalR(hubOptions =>{  hubOptions.ClientTimeoutInterval = TimeSpan.FromMinutes(10);  hubOptions.KeepAliveInterval = TimeSpan.FromMinutes(10);  hubOptions.HandshakeTimeout = TimeSpan.FromMinutes(10);});

and this on the Blazor app

hubConnection.ServerTimeout = TimeSpan.FromMinutes(10);

After 15 seconds, sometimes I get this:

'The current thread is not associated with the Dispatcher. Use InvokeAsync() to switch execution to the Dispatcher when triggering rendering or component state.'

How can I increase the timeout?

Thank you.