Coospo HRM not pairing

I just purchased a Coospo HRM. It paired with Zwift the first couple of times I used it (via Bluetooth) but now when I click on Search I get nothing. It beeps when I put it on so it is getting a signal from my heart, and it is available for pairing on my Garmin Fenix 5 (though not paired) but still Zwift doesn’t seem to recognize it. Any ideas?