I figured it out. For the form, I had this:

<form
                onSubmit={submit}
                action={flow && flow.ui.action}
                method={flow && flow.ui.method}
                id="social-login-form"
                noValidate
            >

Instead of this:

<form
                action={flow && flow.ui.action}
                method={flow && flow.ui.method}
                id="social-login-form"
            >

Second snippet worked.

So I think I spoke too soon. The social sign up seems to be working as intended, but the passkey registration doesn’t create a user in the backend. Moving through the passkey registration prompts works fine (selecting biometric, creating passkey, etc.), and it redirects to the app, but after this all happens, when I check the console, no user was created. There’s a few reasons I’ve come up with why this might be happening: 1. I found a sample project for passkeys that doesn’t use self service flows, and it has a script tag my implementation does not. It adds an event listener to the webauthn_registration_trigger. I’ve followed the instructions given under the advanced intigrations, and either this extra script is not needed when you’re designing your own ui, or somehow I need to add it.

2. There may be an issue with the fact that this is a local development environment I’m working with, so the localhost hostname may be causing a problem.

Please let me know if any of these issues I’ve provided you think are correct. I’m really at a loss at this point.