Pro 2 with relay?

Just wondering if anyone has gotten Pro 2 working with a 24vac relay. I’ve tried 3 different relays, 2 different Pro 2s, 16vac & 24vac transformer and nothing has worked. When wired like the picture below, the Pro 2 will turn on and function as normal but whenever i press the button, it won’t trigger the relay. What’s crazy is when I have it hooked up to a mechanical chime everything works as it should. Any ideas?