We have a macOS app (io.formhealth.SideCore) that acts as a browser-style wrapper, embedding multiple web applications in WKWebView panes. We need the com.apple.developer.web-browser.public-key-credential entitlement so that WebAuthn/passkey flows (e.g. Google OAuth) work within the embedded webviews. The capability doesn't appear on macOS App IDs in the developer portal, and the entitlement request form at developer.apple.com/contact/request/system-extension returns "Your account can't access this page." What's the correct process to request this entitlement for a non-App-Store macOS app?