> does not respond to WebAuthn APIs
Hmm, is it still the case? I don't have an iPhone, but after reading this post https://www.yubico.com/2019/09/yubico-ios-authentication-exp... my understanding was that WebAuthn will now work with all browsers, not only Brave.
No, I tried it. The APIs work normally from the web application perspective, but no prompt comes up to connect the security key. You also need to enable it from the experimental features page.