From the log file snippet above it looks like you enter the pairing screen, and then the program exits.
Do you use ANT+ or BLE (Bluetooth)? If the latter, try to install vc_redistx64.exe (it is probably in the %programfiles(x86)%\zwift folder or can be downloaded – see link here: Zwift PC Bluetooth issues - #95 by M.Milner
If that doesn’t help I recommend you contact Zwift Support with your problem.