No HR icon on Bluetooth screen with app - iPhone - Apple watch

Hi everyone,
I have a wahoo kickr on the way, but in the meantime, I thought I’d fire up my old dumb trainer with my Apple Watch and ride. Whelp, I have the app installed on both my iPhone and my Apple Watch, I boot up and go to connect devices and there’s no HR monitor icon. Only a power source and a speed sensor. Now here’s the weird part… I’m new to zwift. Never paired either. So why isn’t it recognizing the watch as a HR monitor when I have everything “allowed” in my watch to pair? Health is set to on. Bluetooth activated. Watch pairs to everything else under the sun … I even turned off the other items that I normally pair with my watch to not suck up the Bluetooth (if that’s a thing.) what am I missing?