Zone True Wireless is not connected to the receiver?
Please make sure that you take the buds out of the case, check if the receiver LED is ON or not
If the LED is not on, while you Zone True Wireless are out of the case, please plug/unplug your receiver. Then put the earbuds back in the case. Wait for 15 seconds, and open the case
If the LED is still not ON, please try to plug the receiver to another USB port
If the LED is still not ON, please do a factory reset
If the LED is still not ON, you may try to repair the receiver in Logi Tune