private List<SingleSignOnParticipationStrategy> getSupportingSingleSignOnParticipationStrategies(
        final SingleSignOnParticipationRequest context) {
        return providers.stream()
            .filter(p -> p.supports(context))
            .collect(Collectors.toList());
    }
Add providers.

@param provider the provider
core/cas-server-core-webflow-api/src/main/java/org/apereo/cas/web/flow/ChainingSingleSignOnParticipationStrategy.java