Can I connect my Tacx Neo 2T with ANT+ Garmin HR monitor

I set up my Tacx Neo 2T yesterday (EU version).  I had an older (5-6 years old) Garmin ANT+ HR monitor strap that I figured I could connect with the Tacx training app.

I run the app on my recent iPad Air.  It could find the trainer no problem, but not the HR monitor.

I know the battery is fine cause I took it out of my Sigma HR monitor which is working fine on my Sigma bike computer before and after...

Should this be possible and if so what are the steps to work through this since it wont recognize it automatically?

Otherwise, do I need to get a BLE HR monitor?

Thanks for your help, Alain.