Hi @Dev_Gurung and welcome to the forums! I’ve been having trouble with my Garmin dual HRM since the update at the end of October. Here is a thread with lots of suggestions https://forums.zwift.com/t/garmin-hrm-no-signal-solved/209400/162. Hopefully something here will help, and if you find a solution, please do post it as nothing has worked for me yet. Good luck!