I have generated and attested a key with the attestKey function of the AppAttest service provided by Apple.

Now, I would like to be able to reuse this attested key for crypto-stuff operations (manually I mean).

Unfortunatelly, it seems that it’s not possible. It looks like the key is not accessible outside the framework.
Demonstration can be find on this GitHub repo: not-reusable-attested-key-ios-demo

Is there any possibility to do that?