USB-C to Lightning Adapter

Are you using Apple certified products? It is likely that the malfunction is due to your device being manufactured by a company other than Apple.

There is a chip inside of the connector when produced by Apple, if your device is off-brand, it likely will not work.

Hope this helps.

All original products from Apple not work with Adapter USB Typ C - Lightning APPLE MUQX3ZM/A :-(

Except lightning earpods and lightning - 3.5mm jack adapter

edit:

I regret buying it.

Apple may provide a firmware update that enables this adapter to work with other Apple adapters.

They just don't work. I have all Apple products.

See this post iPhone USB C to Lightning Doesn't work! - Apple Community

Doesn't work :-(