Would it be the Horizon GR7, not CR7?
There’s a troubleshooting thread here: Horizon GR7 troubleshoting - #46 by Romano_Studer_Jarasp
From what I’m gathering, the bike doesn’t actually measure power. Rather, whatever data it generates/collects is processed by an app on their tablet which is then forwarded via Bluetooth to other apps like Kinomap and Zwift.
The problem with that approach (instead of measuring power directly and broadcasting using a standard ANT+FEC or BLE-FTMS protocol) is its highly dependent on the intermediate software working perfectly. Unfortunately, it seems like Horizon hasn’t stayed on top of maintaining their software.
In the above-linked thread, it was mentioned you could use the qzdomyos app which is a tool some people use on a smartphone to connect incompatible fitness equipment (ellipticals, spin bikes) to Zwift.
While the GR7 was on the supported device list, until/unless Horizon fixes their app, you’ll have to look for other solutions.