Then, you can install the bundle or the complete framework:
composer require web-auth/webauthn-symfony-bundle #Will only install the bundle
composer require web-auth/webauthn-framework# Will install the whole framework (not recommended)
As the recipes are third party ones not officially supported by Symfony, you will be asked to execute the recipe or not. When applied, the recipes will prompt a message such as WebAuthn Framework is ready.
Without Symfony Flex
If you don't use Symfony Flex, you must register the bundle manually.