We’re sorry that connecting your iPhone to use with Bezel isn’t working as expected. This page has some things you can try get the connection working.
—Tom & Mathijs
<aside> 💁 Please note This article talks about iPhone exclusively, but the all steps are equally applicable when connecting an iPad.
</aside>
Sometimes the cable just doesn’t connect as expected. A simple unplug and replug might help.
Sometimes the piece of macOS that handles the device connections get stuck, a reset of all device connections might solve this.
The cable not connecting properly can also be the issue. Even if charging works, sometimes not enough data can be transmitted over a defective cable or some USB-hubs.