web
Sets or displays the authentication domain, typically your user pool domain, that passkey providers must use as a relying party (RP) in their configuration. Under the following conditions, the passkey relying party ID must be the fully-qualified domain name of your custom domain:
The user pool is configured for passkey authentication.
The user pool has a custom domain, whether or not it also has a prefix domain.
Your application performs authentication with managed login or the classic hosted UI.