Why is this exception not caught?

You're just printing out the task - which won't even have completed yet.

Printing out the task doesn't wait for it to complete, or try to fetch the value.

If you change your code to:

try
{
    task.Wait();
}

... then I'd expect it to catch the exception.

(I was previously using Task<T>.Result, but I notice this is a task with no return value, so it would just be the non-generic Task.)

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