All - Had the same issue where my Garmin HRM-DUAL was working fine for months and then mysteriously stopped presenting the BPM # on the device (ZWIFT, WAHOO, etc…). Did everything folks are sharing and the only solution is to reset the device to factory settings (iphone/ipad/etc.) and start from scratch - yes, reinstall ALL your apps. Not sure what drives the conflict, but it’s not a ZWIFT or WAHOO issue… Hope this helps and thanks to those that shared their experience and solve!
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