Depending on your sensor setup with your CABLE, you will need to choose Power Source or Speed Sensor when creating your setup with Zwift.

Power Source

When to use the Power Source Setup

You will need to use the Power Source Setup when you have a CABLE compatible Bike Power ANT+ sensor that you want to use during your Zwift ride.

Open the CABLE Util app, select Tap For Menu and then Scan ANT+ Sensors. Select your Bike Power sensor and other CABLE compatible ANT+ sensors that you would like to use with your CABLE. Then select Save Sensors.
After your CABLE reconnects to the app, you will need to select your assignments on the ANT+ <-> BLE Assignments page. For Bike Power you will use the CPS assignment. Also if you are using any other CABLE compatible ANT+ sensors, select their assignment at this point too. Then select Save Assignments.
Ensure that your workout data is broadcasting via Bluetooth on the BLE (OUT) page. Completely close the CABLE Util app so that the Bluetooth connection is disconnected between the app and your CABLE.
Open up the Zwift app, select Power Source to tap to pair. Select your CABLE when it appears. Also select your trainer at this point. For your other sensors that you have saved their assignments through the CABLE Util app, select the sensor and select CABLE for device.
Enjoy your ride!

You will need to use the Speed Sensor Setup when you have a CABLE compatible Bike Speed ANT+ sensor that you want to use during your Zwift ride.

Open the CABLE Util app, select Tap For Menu and then Scan ANT+ Sensors. Select your Bike Speed sensor and other CABLE compatible ANT+ sensors that you would like to use with your CABLE. Then select Save Sensors.
After your CABLE reconnects to the app, you will need to select your assignments on the ANT+ <-> BLE Assignments page. For Speed you will use the CSCS assignment. Also if you are using any other CABLE compatible ANT+ sensors, select their assignment at this point too. Then select Save Assignments.
Ensure that your workout data is broadcasting via Bluetooth on the BLE (OUT) page. Completely close the CABLE Util app so that the Bluetooth connection is disconnected between the app and your CABLE.
Open up the Zwift app, select Speed Sensor to tap to pair. Select your CABLE when it appears. Also select your trainer at this point. For your other sensors that you have saved their assignments through the CABLE Util app, select the sensor and select CABLE for device.
Enjoy your ride!