After updating the smartphone's software to Android 14, the Android Auto feature cannot be used wirelessly.

We have been informed that the Android Auto feature cannot be used wirelessly after updating to Android 14. You can still use the Android Auto feature with a wired connection so we recommend that you use the wired connection until a fix is provided.

Google has provided an official response regarding this issue on their website that states an Android OS update with the fix is coming soon. For details please refer to the article that contains that response on the Android Auto Help website.
Note: The URL provided is to a Google website and is subject to change.