1- it is connecting to my Fenix 6x pro and I confirm that in 2 ways (in the sensors connected, and when starting a run activity I can see the dynamic screens), however the green light on my watch are still working (I read everywhere that they should stop) and I don't feel that the heart beat is more accurate actually
If you have an activity started on the watch you do not need to be close to the watch. After you finish the activity you should get an option to download…. Ensure your 745 is paired to your HRM-Pro in Sensors and Activities. Once paired, your 745 will automatically find your HRM-Pro when you select an activity, provided you are wearing it

The heart rate monitor calculates your running pace and distance based on your user profile and the motion measured by the sensor on every stride. The heart rate monitor provides running pace and distance when GPS is not available, such as during treadmill running. You can view your running pace and distance on your compatible Garmin ® device

Finally Garmin introduced the HRM-Pro in September 2020. The HRM-Pro is the ‘top of the line’ and has all the features of the previous heart rate monitors and you van read my full review here. Except that it’s not detachable like the Dual and doesn’t have the grippy strap like the swim. But it does allow stand alone monitoring and
The Polar H10 suffered from repeated broadcast problems to the treadmill, but ANT+ to my Forerunner 935 was just fine. I purchased the HRM-Pro Plus to hopefully solve this problem, and can't help but notice that the data quality in Garmin Connect seems to be much better, less choppy, so guessing sampling is far better.
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garmin hrm pro does not connect