Can you provide more details of your setup?
For what it’s worth, some of the recent Zwift app updates caused sensor connectivity issues for many people. For me, on iPad, PC, and AppleTV, I had to completely uninstall Zwift, reboot the devices, reinstall Zwift and effectively start from scratch. It’s been working find on the latest app versions. (BLE and ANT+, across platforms)
EDIT - 100% make sure you’re running the latest operating system.