I've recently purchased a Wahoo TRACKR HR monitor, and like my 5 year old TICKR before it, I just tried to use it with bluetooth for giggles.
Garmin just can't work with bluetooth. Even Garmin's own Speed and Cadence sensor kit, if one connects with bluetooth, its a hit and miss affair that it will even connect after it pairs.
Now the odd thing is with my new TRACKR, is that it eventually connects to the sensor via bluetooth, and shows connected under the Sensor list, but it doesn't display my heart rate.
If I remove the device, and re-pair it, which takes very long itself, it will show my heart rate. Switch the EDGE device off and back on again, it either won't connect to the HR monitor, and if or when it does connect, it won't show an actual heart rate.
Bluetooth was flaky on my EDGE 530. And it's flaky on my EDGE 840. How is this still a thing in 2025/2026?
ANT+ connection for the HR monitor works fine on the EDGE, and bluetooth works fine with the TRACKR on my phone, Apple Watch, and whatever other devices I connect with it via bluetooth.