If you don't want to change the method signature to return void (as returning void should always be avoided), you can use C# 7.0+ Discard feature like this, which is slightly better than assigning to a variable (and should remove most other source validation tools warnings):

public static void DoStuff()
{
    _ = GetNameAsync(); // we don't need the return value (suppresses warning)
    MainWorkOfApplicationIDontWantBlocked();
}