There was a reply on Facebook by James Bailey last week: Zwift Racers | Facebook
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thanks I knew I saw it somewhere - been searching on here for it. 
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since this last update can’t use the latest Garmin HRM Plus with Apple TV 2022,the HRM sensor is connected to Zwift but says “no signal” and shows no readings,this when “pairing via phone” until yesterday it has worked well but today no readings again,when zwifting via a PC i3 win11 no problems at all,it would be nice to receive some feed back on this issue,many thanks.
strange that stuff gets posted to fakebook before it gets posted to the official forum
James has been MIA in the forums for months, he got sick of us 
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And Jon abandoned the company forum in favor of Reddit
Currently seemed borked, no names showing no pace partners and everyone is in orange kit
Lots of people saying the same thing
Have you had any joy with this? ERG has become unusable on the Wattbike.
I had the same problem. Yesterday, I deleted the app (on Mac) twice and a third time today, and it finally works after the third re-install.