HR MONITOR connects with ZWIFT but says NO SIGNAL, please help!

Are you wearing it at the time or just connecting?

Tried a new battery?

If I connect my Garmin HR it will sometimes say no signal until I’m wearing it but give really high readings until it makes a decent connection (I start sweating).

It worked again on one occasion, I turned off my garmin watch in case it was interfering, but then in subsequent sessions it stopped working again. I will prove what you tell me. Thank you