For my case, i am using it with NFC and somehow the security key is not detected or there are some NFC hardware issues. The callback is not triggered until timeout. Any idea on NFC troubleshooting?

It was concluded that is issue with code implementation.

Have you managed to resolve the issue? I had similar problem with not getting callback in delegate after calling ASAuthorizationController.performRequest(). Apparently my security key is not showing signal.

i tried FX1 and Yubi Key both are not responding to my iOS App. I am using iPhone 6s and i attached it using the following method: Lightning to USB -> USB to USB-Type C -> Token. It is working with Webauthn.io using Safari but not the iOS App using ASAuthorizationController. I modified the ASAuthorizationController to use PassKey and is working but not to the external security key. Tested on another device, Safari Webauthn.io is working with the external security key but not in the iOS App.