Greetings bsurbeck,
Start by ensuring that you've allowed access to the USB device:
"You can allow your iPhone, iPad, or iPod touch to always access accessories. For example, if you use a USB assistive device to enter your passcode on your locked iPhone, many assistive devices automatically turn on the setting to allow USB devices the first time they're connected.
If you don't connect to accessories regularly, you might need to turn on this setting manually.
In Settings, go to Face ID & Passcode or Touch ID & Passcode, and turn on Accessories under Allow Access When Locked." Allow USB and other accessories to connect to your iPhone, iPad, or iPod touch
If the issue continues, reach out to Belkin for support with their accessory: Contact Us - Belkin
We hope this helps!
Sincerely.