Page Comparison

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<bean parent="SAML2.SSO" p:defaultAuthenticationMethods>
	<property name="defaultAuthenticationMethods">
		<list>
			<bean parent="shibboleth.SAML2AuthnContextClassRef"
				c:classRef="urn:oasis:names:tc:SAML:2.0:ac:classes:TimeSyncToken" />
		</list>
	</property>
</bean>

is equivalent to an SP for which the configuration applies requesting this:

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When the request to the IdP does have explicit method requirements, or a defaultAuthenticationMethod defaultAuthenticationMethods property is set on the applicable profile configuration, then the selection process is as follows:

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