I recently ran into some issues using WebAuthn in the context of WKWebView and happened to run across the answer to your question. I ran into this while investigating this bug: https://bugs.webkit.org/show_bug.cgi?id=237380a Per comments from WebKit devs on that bug, WebAuthn is not supported in WKWebView unless your app specifically has the Web Browser entitlement in which case it is then enabled. Also, if you invoke WebAuthn-related functions like navigator.credentials.create() or window.PublicKeyCredential.isUserVerifyingPlatformAuthenticatorAvailable() there is a bug where the promise returned from those methods in a WKWebView context on iOS never resolves. I ended up working around it by executing the initial isUserVerifyingPlatformAuthenticatorAvailable() in a Promise.race() with a timeout so that I could at least determine that WebAuthn was not supported in that context. Hope this helps, Kevin Flanagan