Hi,
community.podlove.org offers a passkey login, however the feature seems to be broken. Settings→Security shows an option to add passkeys. When doing so (in my case with a YubiKey) the brower starts negotiating the parameters and sends the necessary attestation and client data as POST to https://community.podlove.org/u/register_passkey.json. The server responds with HTTP/500 and the payload {status: 500, error: "Internal Server Error"}.